Sight Glass Seals | McMaster-Carr

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System of Measurement

Pipe Size

Thread Type

UN/UNF (SAE Straight)

Material

Window Diameter

For Use With

Hydraulic Fluid (Petroleum Based)

Thread Size

Hex Size

For Liquid Appearance

Clear

Dark

Maximum Pressure @ Temperature

Window Material

Maximum Temperature

Hole Diameter

Mount Type

Seal Material

Minimum Temperature

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Performance

Flange OD

Specifications Met

For Maximum Tank Wall Thickness

155 Products

Sights

These sights have a glass window. Screw them into threaded holes on tanks, gear cases, bearing housings, and mixers to see inside.

Brass with Glass Window


BSPP Thread, For Clear Liquids	BSPP Thread For Dark Liquids	NPTF Thread, For Clear Liquids	NPTF Thread For Dark Liquids

BSPP Thread—Sights with BSPP (British Standard Pipe Parallel) threads are often used with imported equipment.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

								For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each		Each
NPTF Male



		1/4	1/4"	5/8"	150 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K21	000000	———	0


		1/4	1/4"	5/8"	675 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K71	00000	———	0
		3/8	3/8"	3/4"	100 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K22	0000	1210K32	00000
		3/8	3/8"	3/4"	415 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K72	00000	1322K82	00000
		1/2	1/2"	7/8"	100 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K23	0000	1210K33	00000
		1/2	1/2"	7/8"	250 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K73	00000	1322K83	00000
		3/4	3/4"	1 1/8"	60 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K24	00000	1210K34	00000
		3/4	3/4"	1 1/8"	200 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K74	00000	1322K84	00000
		1	1"	1 3/8"	60 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K25	00000	1210K31	00000
		1	1"	1 3/8"	100 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K75	00000	1322K85	00000
		1 1/4	1 1/8"	1 3/4"	25 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K26	00000	1210K36	00000


		1 1/4	1 1/8"	1 3/4"	60 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K76	00000	1322K86	00000
		1 1/2	1 3/8"	2"	25 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K27	00000	1210K37	00000
		1 1/2	1 3/8"	2"	50 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K77	00000	1322K87	00000
		2	1 7/8"	2 1/2"	10 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K28	00000	1210K38	00000
		2	1 7/8"	2 1/2"	20 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K78	000000	1322K88	000000


		BSPP Male



				3/8	3/8"	3/4"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T2	00000	6395T1	00000


				1/2	1/2"	7/8"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T4	00000	6395T3	00000
				3/4	5/8"	1 1/8"	360 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T6	00000	6395T5	00000
				1	1"	1 3/8"	290 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T8	00000	6395T7	00000

Steel with Glass Window


NPT Thread, For Clear Liquids	NPT Thread For Dark Liquids	NPTF Thread, For Clear Liquids	NPTF Thread For Dark Liquids

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

							For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each		Each
NPT Male







				With Fused Window

				1/2	1/2"	15/16"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K14	00000	3277K34	000000


				1	1"	1 3/8"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K18	00000	3277K38	00000
				1 1/4	1 1/4"	1 3/4"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K23	00000	3277K43	00000
				1 1/2	1 1/2"	2"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K25	00000	3277K45	00000
				2	2"	2 1/2"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K27	00000	3277K47	00000


				NPTF Male







								With Fused Window

								3/8	3/8"	3/4"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K12	00000	3277K32	00000


								3/4	3/4"	1 1/16"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K16	00000	3277K36	00000

Aluminum with Glass Window


BSPP Thread, For Clear Liquids	BSPP Thread For Dark Liquids

Aluminum sights have good corrosion resistance.

BSPP Thread—Sights with BSPP (British Standard Pipe Parallel) threads are often used with imported equipment.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

								For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each		Each
BSPP Male



		3/8	3/8"	3/4"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K11	000000	3434K32	000000


		1/2	1/2"	7/8"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K13	00000	3434K33	00000
		3/4	5/8"	1 1/8"	360 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K15	00000	3434K35	00000
		1	1"	1 3/8"	290 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K17	00000	3434K37	00000
		1 1/4	1 1/4"	1 3/4"	180 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K19	00000	3434K39	00000

303 Stainless Steel with Glass Window


BSPP Thread For Dark Liquids	BSPP Thread For Dark Liquids	NPT Thread, For Clear Liquids	NPT Thread For Dark Liquids

303 stainless steel sights are more corrosion resistant than brass, steel, and aluminum sights.

BSPP Thread—Sights with BSPP (British Standard Pipe Parallel) threads are often used with imported equipment.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

								For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each		Each
NPT Male



		1/4	1/4"	5/8"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T11	000000	———	0


		3/8	3/8"	3/4"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T12	00000	6490T19	000000
		1/2	5/8"	1"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T13	00000	6490T21	00000
		3/4	3/4"	1"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T14	00000	6490T22	00000
		1	1"	1 3/8"	100 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T15	00000	6490T23	00000
		1 1/4	1 1/4"	1 3/4"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T16	00000	6490T24	00000
		1 1/2	1 1/2"	2"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T17	00000	6490T25	00000
		2	2"	2 1/2"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T18	000000	6490T26	000000


		BSPP Male



				3/8	3/8"	3/4"	725 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T1	00000	6396T31	00000


				1/2	1/2"	7/8"	725 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T2	00000	6396T32	00000
				3/4	5/8"	1 1/8"	360 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T3	00000	6396T33	00000
				1	1"	1 3/8"	290 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T4	00000	6396T34	00000

Shatter-Resistant Sights

The window and body are made from a single piece of plastic, making these sights more shatter resistant than sights with a glass window. They are not rated for pressure.

Plastic with Plastic Window

Image of Product. Front orientation. Sights. Shatter-Resistant Sights.

	Pipe Size	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each
NPT Male







		With One-Piece Construction

		1/2	—	1/2"	1"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K11	00000


		3/4	—	5/8"	1 1/4"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K12	0000
		1	—	7/8"	1 1/2"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K13	00000


		BSPP Male







						With One-Piece Construction

						1/4	—	3/8"	5/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K31	0000


						3/8	—	3/8"	3/4"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K32	0000
						1/2	—	1/2"	7/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K33	0000
						3/4	—	3/4"	1"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K34	0000
						1	—	1"	1 3/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K35	0000
						1 1/4	—	1 1/8"	1 5/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K36	00000


						Metric Male







										With One-Piece Construction

										—	M16 × 1.5 mm	7/16"	3/4"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K111	0000


										—	M20 × 1.5 mm	9/16"	7/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K112	0000
										—	M25 × 1.5 mm	11/16"	1 1/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K113	0000
										—	M27 × 1.5 mm	13/16"	1 1/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K114	0000
										—	M30 × 1.5 mm	7/8"	1 3/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K115	0000
										—	M40 × 1.5 mm	1 3/16"	1 5/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K116	00000


										UN/UNF (SAE Straight) Male







With One-Piece Construction

—	3/4"-16													1/2"	7/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K117	0000


—	1 1/16"-12													3/4"	1 3/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K118	00000

Weld-On Sights

Weld these sights to single-wall tanks. They’re often used to monitor contents in process vessels, mixers, and bulk containers.

304 Stainless Steel with Glass Window


With Bolt-On Window	With Bolt-On Window (Unassembled)

With Bolt-On Window—Sights with a bolt-on window should be welded to a hole in your tank wall.

Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each







With Bolt-On Window

4 11/16"	5"	3 1/2"	60 psi @ 70° F	-40 to 300	Water, Hydraulic Fluid	Silicone Rubber	4201K32	0000000

316L Stainless Steel with Glass Window


With Screw-Together Window (Unassembled)	With Screw-Together Window

316L stainless steel sights are more corrosion resistant than 304 stainless steel sights.

With Screw-Together Window—Sights with a screw-together window make it easier to access your tank and clean the window than sights with a bolt-on window. To install these sights, place the body in a hole on your tank wall and weld it. Then twist on the window and tighten with a spanner wrench.

DIN 11851—DIN 11851 rated sights meet dairy fitting standards.

Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material	Specs. Met		Each







With Screw-Together Window

2"	3 5/8"	2"	150 psi @ 70° F	-20 to 390	Water, Hydraulic Fluid, Compressed Air	Silicone Rubber	DIN 11851	4814K54	0000000


2 1/2"	4 7/16"	2 1/2"	150 psi @ 70° F	-20 to 390	Water, Hydraulic Fluid, Compressed Air	Silicone Rubber	DIN 11851	4814K55	000000
3 1/8"	5"	3 1/8"	150 psi @ 70° F	-20 to 390	Water, Hydraulic Fluid, Compressed Air	Silicone Rubber	DIN 11851	4814K56	000000
4"	5 13/16"	4"	150 psi @ 70° F	-20 to 390	Water, Hydraulic Fluid, Compressed Air	Silicone Rubber	DIN 11851	4814K57	000000
5"	7"	5"	90 psi @ 70° F	-20 to 390	Water, Hydraulic Fluid, Compressed Air	Silicone Rubber	DIN 11851	4814K58	00000000

Press-Fit Through-Wall Sights

Press these sights into a hole in your tank wall; no additional mounting nuts are needed. They mount from the outside. The shatter-resistant plastic domed window allows you to view tank contents from multiple angles.

Zinc-Plated Brass with Plastic Window

Image of Product. Front orientation. Sights. Press-Fit Through-Wall Sights.

OD	Window Dia.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each



1 1/4"	1 1/4"	1"	9/32"	Not Rated	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K11	000000


1 1/2"	1 1/2"	1 1/4"	9/32"	Not Rated	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K12	00000
2"	2"	1 5/8"	9/32"	Not Rated	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K13	00000

Easy-View Sights

View tank contents from multiple angles through the plastic domed window.

Zinc-Plated Steel with Plastic Window

Zinc-plated steel sights have a shatter-resistant window.

	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each
NPT Male



	3/4	1"	1 1/4"	10 psi @ 70° F	0 to 160	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	1128K3	000000


	1	1"	1 1/2"	10 psi @ 70° F	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K4	00000
	1 1/4	1 1/4"	1 7/8"	10 psi @ 70° F	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K5	00000
	1 1/2	1 5/8"	2 1/8"	10 psi @ 70° F	0 to 160	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	1128K6	00000

Plastic with Plastic Window

Plastic sights have an impact-resistant window and brass threads.

	Window Dia.	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each
NPT Male



	1/4	3/8"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T21	000000


	3/8	1/2"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T22	00000

High-Visibility Sights

Easily view liquid movement and level changes from a distance—these sights have an indicator ball inside the glass window. They also have a reflector that makes dark liquid easy to see, especially in low-light conditions.

Brass with Glass Window

Image of Product. Front orientation. Sights. High-Visibility Sights.

Brass sights have good corrosion resistance.

								For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each
NPTF Male







				With Indicator Ball

				3/4	3/4"	1 1/8"	200 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K81	000000


				1	15/16"	1 7/16"	100 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K82	00000
				1 1/4	1 1/8"	1 3/4"	60 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K83	00000
				1 1/2	1 3/8"	2"	50 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K84	00000
				2	1 7/8"	2 1/2"	20 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K85	000000

Steel with Glass Window

UN/UNF (SAE Straight) Thread—UN/UNF (SAE Straight) threads are also known as O-ring boss threads.

									For Dark Liquids
	Thread Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material	Specs. Met		Each
UN/UNF (SAE Straight) Male







				With Indicator Ball

				3/4"-16	9/16"	7/8"	75 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K87	000000


				1 1/16"-12	3/4"	1 1/4"	75 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K88	00000
				1 5/16"-12	15/16"	1 1/2"	75 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K89	00000

Through-Wall Sights

Mount these sights from the inside of your tank and secure with a lock nut. They install through unthreaded holes in tank walls.

Aluminum with Glass Window


For Clear Liquids	For Dark Liquids

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

									For Clear Liquids		For Dark Liquids
For Hole Dia.	Window Dia.	Hex Size	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material	Includes		Each		Each



	3/4"	1/2"	7/8"	1/4"	50 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	1116K21	000000	1116K31	000000


	1"	3/4"	1 1/8"	1/4"	50 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	1116K22	00000	1116K32	00000
	1 1/4"	1"	1 3/8"	1/4"	25 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	1116K23	00000	1116K33	00000
	1 7/8"	1 3/8"	2"	1/4"	25 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	1116K24	00000	1116K34	00000
	2 3/8"	1 7/8"	2 5/8"	1/4"	10 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	1116K25	00000	1116K35	00000

303 Stainless Steel with Glass Window


For Clear Liquids	For Dark Liquids

303 stainless steel sights are more corrosion resistant than aluminum sights.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

									For Clear Liquids		For Dark Liquids
For Hole Dia.	Window Dia.	Hex Size	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material	Includes		Each		Each



	5/8"	7/16"	13/16"	3/16"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T11	000000	6191T18	000000


	3/4"	9/16"	15/16"	3/16"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T12	00000	6191T19	00000
	1"	13/16"	1 1/4"	3/16"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T13	00000	6191T21	00000
	1 1/4"	1"	1 1/2"	1/4"	100 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T14	00000	6191T22	00000
	1 1/2"	1 5/16"	1 3/4"	7/16"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T15	00000	6191T23	000000
	1 3/4"	1 9/16"	2"	7/16"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T16	000000	6191T24	000000
	2 1/4"	1 15/16"	2 1/2"	7/16"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	Lock Nut	6191T17	000000	6191T25	000000

Easy-View Flanged Sights

Check the contents of your tank from multiple angles with the domed window on these sights. The window is plastic, so it’s shatter resistant. To mount these sights, fasten their extended flange to tank walls.

Zinc with Plastic Window

Window Dia.	Bolt Circle Dia.	No. of Bolt Holes	For Screw Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each



2 1/4"	1 1/4"	1 7/8"	4	No. 8	10 psi @ 70° F	0 to 160	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	1128K22	0000000

Flanged Sights

An extended flange makes these sights easy to bolt onto tank walls. Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

Zinc with Glass Window

Image of Product. Front orientation. Sights. Flanged Sights.

									For Dark Liquids
Flange OD	Window Dia.	Bolt Circle Dia.	No. of Bolt Holes	For Screw Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each



	1 5/8"	3/4"	1 5/16"	4	No. 6	10 psi @ 70° F	-20 to 250	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3946N16	000000


	1 7/8"	1"	1 9/16"	4	No. 6	10 psi @ 70° F	-20 to 250	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3946N17	000000
	2 9/16"	1 1/2"	2 5/32"	4	No. 8	10 psi @ 70° F	-20 to 250	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3946N19	00000

Zinc-Plated Steel with Glass Window

									For Dark Liquids
Flange OD	Window Dia.	Bolt Circle Dia.	No. of Bolt Holes	For Screw Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each



	2 1/4"	1 1/4"	1 7/8"	4	No. 8	10 psi @ 70° F	-20 to 250	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3946N18	0000000


	3 1/8"	2"	2 11/16"	4	No. 10	10 psi @ 70° F	-20 to 250	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3946N21	000000