Through Wall Sights | McMaster-Carr

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75 Products

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

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

Shatter-Resistant Oil-Level and Temperature Indicators

The nylon body and window make these indicators shatter resistant. Use them to simultaneously monitor hydraulic fluid or oil level and temperature. All are UV resistant for use outdoors.

Through-Wall Mount


Nylon	Nylon With Aluminum Guard	Nylon With Glass-Filled Nylon Guard	Nylon With Steel Guard

Aluminum Guard and Glass-Filled Nylon Guard—Indicators with a glass-filled nylon or aluminum guard, or no guard, mount from the inside of your tank through unthreaded holes. Glass-filled nylon guards are more impact resistant than aluminum guards.

Steel Guard—Indicators with a steel guard have a lower profile and can withstand higher pressure than other indicators. Mount them from the outside of your tank through threaded holes.

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Thermometer Temp. Measurement Range, ° F	Display Type	Seal Material	Window Material	For Use With	Features	Includes		Each
Nylon







	For 1/2" Dia. Holes (2 Holes)

	3"	4 1/4"	2 1/16"	13/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K21	000000


	5"	6 1/4"	4 1/16"	13/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K23	00000
	10"	11 1/4"	9 1/16"	13/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K26	00000


	Nylon with Aluminum Guard







					For 1/2" Dia. Holes (2 Holes)

					3"	4 3/4"	2 1/16"	15/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K22	00000


					5"	6 3/4"	4 1/16"	15/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K24	00000
					10"	11 3/4"	9 1/16"	15/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K27	00000


					Nylon with Glass-Filled Nylon Guard







									For 1/2" Dia. Holes (2 Holes)

									5"	6 3/4"	4 1/16"	15/16"	1/2"	10 psi @ 70° F	-65 to 210	30 to 210	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	Mounting Nuts	4748K25	00000


									Nylon with Steel Guard







													For 1/2" Dia. Holes (2 Holes)

													5"	6 3/8"	3 7/8"	13/16"	1/2"	50 psi @ 70° F	-40 to 210	0 to 220	Scale	Buna-N	Nylon	Hydraulic Fluid, Oil	UV Resistant	—	4748K29	00000

High-Pressure Oil-Level Indicators

Monitor hydraulic fluid or oil level in pressurized applications, such as hydraulic systems where overflow is a concern. These indicators have a metal gauge shield that protects the glass window from impact. Clear liquids magnify a red line at the back of the window, so their levels are easier to see.

Through-Wall Mount

Through-wall indicators mount from the inside of your tank through unthreaded holes. Secure with nuts on the inside of your tank.

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Fitting Material	Seal Material	Window Material	For Use With	Features	Includes		Each
Aluminum







	1/2"-20 UNF Male Thread—For 1/2" Dia. Holes (2 Holes)

	3"	4 5/8"	1 1/2"	7/8"	3/4"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K91	000000


	4"	5 5/8"	2 1/2"	7/8"	3/4"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K92	00000
	5"	6 5/8"	3 1/2"	7/8"	3/4"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K85	00000
	6"	7 5/8"	4 1/2"	7/8"	3/4"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K86	00000
	7"	8 5/8"	5 1/2"	7/8"	3/4"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K93	00000
	9"	10 5/8"	7 1/2"	7/8"	3/4"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K87	00000
	10"	11 5/8"	8 1/2"	7/8"	3/4"	275 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K94	00000
	12"	13 5/8"	10 1/2"	7/8"	3/4"	270 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1106K95	00000

Screw In/Through-Wall Mount

Screw-in/through-wall indicators give you the option to mount from the inside or outside of your tank. Use the mounting nuts on the inside of your tank to attach them through unthreaded holes or thread them into pipe or threaded holes on the tank’s outside.

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Fitting Material	Seal Material	Window Material	For Use With	Features	Includes		Each
Aluminum







	1/2"-20 UNF Male Thread—For 1/2" Dia. Holes (2 Holes)

	3"	4 5/8"	1 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K18	000000


	4"	5 5/8"	2 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K21	00000
	5"	6 5/8"	3 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K11	00000
	6"	7 5/8"	4 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K15	00000
	7"	8 5/8"	5 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K12	00000
	9"	10 5/8"	7 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K13	00000
	10"	11 5/8"	8 1/2"	1 1/8"	1/2"	275 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K27	00000
	12"	13 5/8"	10 1/2"	1 1/8"	1/2"	270 psi @ 70° F	-40 to 250	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1188K25	00000

Chemical-Level Indicators

Check the level of liquids containing chemicals such as alcohol-based solvents, boric acid, and sodium bicarbonate. These indicators can be used in pressurized applications where overflow is a concern. All have an aluminum gauge shield that protects the glass window from impact. Clear liquids magnify a red line at the back of the window, so their levels are easier to see.

Through-Wall Mount

Through-wall indicators mount from the inside of your tank through unthreaded holes. Secure with nuts on the inside of your tank.

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Fitting Material	Seal Material	Window Material	For Use With	Features	Includes		Each
Aluminum







	1/2"-20 UNF Male Thread—For 1/2" Dia. Holes (2 Holes)

	5"	6 5/8"	3 1/2"	7/8"	3/4"	290 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N25	000000


	10"	11 5/8"	8 1/2"	7/8"	3/4"	275 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N27	00000
	12"	13 5/8"	10 1/2"	7/8"	3/4"	270 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N28	00000

Screw In/Through-Wall Mount

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Fitting Material	Seal Material	Window Material	For Use With	Features	Includes		Each
Aluminum







	1/2"-20 UNF Male Thread—For 1/2" Dia. Holes (2 Holes)

	3"	4 5/8"	1 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N17	000000


	5"	6 5/8"	3 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N18	00000
	6"	7 5/8"	4 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N19	00000
	8"	9 5/8"	6 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N21	00000
	10"	11 5/8"	8 1/2"	1 1/8"	1/2"	275 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N22	00000
	12"	13 5/8"	10 1/2"	1 1/8"	1/2"	270 psi @ 70° F	-15 to 400	Aluminum	Fluoroelastomer	Glass	Alcohol-Based Solvents, Benzene, Boric Acid, Glycerin, Grease, Hydraulic Fluid, Oil, Sodium Bicarbonate (Baking Soda)	Red Line	Mounting Nuts	3888N23	00000

High-Pressure Oil-Level and Temperature Indicators

Check both the temperature and the hydraulic fluid or oil level in a pressurized system. These indicators are often used in hydraulic systems where overflow is a concern. The aluminum gauge shield protects the glass window from impact.

Through-Wall Mount

Image of Product. Front orientation. Contains Annotated. Liquid-Level Gauges. High-Pressure Oil-Level and Temperature Indicators, Through-Wall Mount.

Through-wall indicators mount from the inside of your tank through unthreaded holes. Secure with nuts on the inside of your tank.

Red Line—Indicators with a red line emphasize the level of clear liquids, so they’re easier to read.

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Thermometer Temp. Measurement Range, ° F	Display Type	Fitting Material	Seal Material	Window Material	For Use With	Features	Includes		Each
Aluminum







	1/2"-20 UNF Male Thread—For 1/2" Dia. Holes (2 Holes)

	4"	5 5/8"	2 1/2"	1 3/16"	3/4"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K67	000000


	5"	6 5/8"	3 1/2"	1 3/16"	3/4"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K68	00000
	6"	7 5/8"	4 1/2"	1 3/16"	3/4"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K69	00000
	7"	8 5/8"	5 1/2"	1 3/16"	3/4"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K71	00000
	8"	9 5/8"	6 1/2"	1 3/16"	3/4"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K72	00000
	12"	13 5/8"	10 1/2"	1 3/16"	3/4"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K73	00000

Screw In/Through-Wall Mount

Image of Product. Front orientation. Contains Annotated. Liquid-Level Gauges. High-Pressure Oil-Level and Temperature Indicators, Screw In/Through-Wall Mount.

Red Line—Indicators with a red line emphasize the level of clear liquids, so they’re easier to read.

	Body Wd.	For Max. Tank Wall Thk.	Max. Pressure @ Temp.	Temp. Range, ° F	Thermometer Temp. Measurement Range, ° F	Display Type	Fitting Material	Seal Material	Window Material	For Use With	Features	Includes		Each
Aluminum







	1/2"-20 UNF Male Thread—For 1/2" Dia. Holes (2 Holes)

	3"	4 5/8"	1 3/8"	1 3/16"	1/2"	20 psi @ 70° F	-40 to 220	60 to 180	Scale	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	—	Mounting Nuts	1305K61	000000


	4"	5 5/8"	2 1/2"	1 1/2"	1/2"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K61	00000
	5"	6 5/8"	3 3/8"	1 3/16"	1/2"	20 psi @ 70° F	-40 to 220	0 to 220	Scale	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	—	Mounting Nuts	1305K62	00000
	5"	6 5/8"	3 1/2"	1 1/2"	1/2"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K62	00000
	6"	7 5/8"	4 1/2"	1 1/2"	1/2"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K63	00000
	7"	8 5/8"	5 1/2"	1 1/2"	1/2"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K64	00000
	8"	9 5/8"	6 1/2"	1 1/2"	1/2"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K65	00000
	10"	11 5/8"	8 3/8"	1 3/16"	1/2"	20 psi @ 70° F	-40 to 220	0 to 220	Scale	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	—	Mounting Nuts	1305K63	00000
	12"	13 5/8"	10 1/2"	1 1/2"	1/2"	125 psi @ 70° F	-40 to 220	50 to 300	Dial	Aluminum	Buna-N	Glass	Hydraulic Fluid, Oil	Red Line	Mounting Nuts	1118K66	00000