Diesel Fuel Floats | McMaster-Carr

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33 Products

Vertical-Mount Float Switches for Fuels and Oils


Float Switch	Float Switch with Splash Guard

Mount these switches from outside the tank through a threaded connection at the top or bottom of your tank. They activate process equipment such as pumps or motors when the diesel fuel, hydraulic fluid, or oil level in your tank reaches the float.

316 Stainless Steel Float—Choose switches with a stainless steel float for durability in harsh conditions.

Splash Guard—Switches with splash guard minimize false switch activation caused by splashing liquid.

	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Overall Dia.	Electrical Connection		Each
120V AC/240V AC Input Voltage







	Buna-N Float

	1/8	NPT	Male	0.45	150 psi @ 70° F	35 to 250	1 9/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1"	1"	Wire Leads	48095K11	000000


	1/8	NPT	Male	0.55	150 psi @ 70° F	35 to 145	1 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Top, Bottom	1"	1"	Wire Leads	48095K61	00000
	1/4	NPT	Male	0.55	150 psi @ 70° F	35 to 145	2 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	Top, Bottom	2"	1 1/4"	Wire Leads	48095K81	00000




			Buna-N Float with Splash Guard

			1/8	NPT	Male	0.55	150 psi @ 70° F	35 to 145	1 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Top, Bottom	1"	1 1/2"	Wire Leads	48095K62	00000


			1/4	NPT	Male	0.55	150 psi @ 70° F	35 to 145	2 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	Top, Bottom	2"	2"	Wire Leads	48095K82	00000




					316 Stainless Steel Float

					1/8	NPT	Male	0.7	300 psi @ 70° F	35 to 300	2 1/16"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	Top, Bottom	1 3/16"	1 1/8"	Wire Leads	4646K82	000000

Dual-Level Vertical-Mount Float Switches for Fuels and Oils

Empty and fill your tank with a single device—these dual-level switches include two float switches that actuate at different levels. The stem can be cut to length. Mount through a threaded connection at the top of your tank.

													Overall
	Pipe Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Ht.	Dia.	Electrical Connection		Each
120V AC/240V AC Input Voltage







				Buna-N Float

				2	NPT	Male	0.55	150 psi @ 70° F	35 to 180	33 1/2"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top	1 11/16"	35"	1 7/8"	Wire Leads	5267K84	0000000




						316 Stainless Steel Float

						2	NPT	Male	0.75	750 psi @ 70° F	35 to 275	34"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top	2"	35 1/2"	2 1/16"	Wire Leads	5267K88	00000000

Horizontal-Mount Float Switches for Fuels and Oils


Style A	Style B	Style C

Style D	Style E	Style F

Install these switches into a threaded connection in your tank wall from outside the tank. They activate process equipment such as pumps or motors when the diesel fuel, hydraulic fluid, or oil level in your tank reaches the float. Choose switches with a metal body for durability in harsh conditions.

Splash Guard—Switches with splash guard minimize false switch activation caused by splashing liquid.

		Pipe												Conduit
	Style	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Float Material	Electrical Connection	Trade Size	Thread Type	Gender		Each
120V AC/240V AC Input Voltage







				Polybutylene Body

				A	1/2	NPT	Male	0.85	100 psi @ 70° F	-40 to 145	2 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Polybutylene	Spade Terminal	—	—	—	50205K35	000000


				A	1/2	NPT	Male	0.85	100 psi @ 70° F	-40 to 145	2 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Polybutylene	Wire Leads	—	—	—	50205K31	00000
				A	1/2	NPT	Male	0.85	100 psi @ 70° F	-40 to 145	2 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Polybutylene	Wire Leads	1/2	NPT	Male	50205K32	00000




						Polybutylene Body and Splash Guard

						B	1	NPT	Male	0.85	100 psi @ 70° F	-40 to 145	1 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Polybutylene	Spade Terminal	—	—	—	50205K36	00000




								PPS Body

								A	1 1/4	NPT	Male	0.7	200 psi @ 70° F	-40 to 190	4 1/8"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	PPS	Wire Leads	—	—	—	7040T11	000000


								C	1 1/4	NPT	Male	0.7	100 psi @ 70° F	32 to 190	4 13/16"	1 Off or 1 On	SPDT	15 amp @ 120V AC	PPS	Wire Leads	—	—	—	7040T12	000000




										316 Stainless Steel Body

										D	1/2	NPT	Male	0.55	100 psi @ 70° F	-40 to 225	3 11/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Polypropylene	Wire Leads	1/2	NPT	Male	46515K12	000000


										D	1/2	NPT	Male	0.65	100 psi @ 70° F	-40 to 250	3 11/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Nylon	Wire Leads	1/2	NPT	Male	5123K22	000000
										E	1	NPT	Male	0.85	500 psi @ 70° F	-40 to 300	5 5/16"	1 Off or 1 On	SPDT	0.17 amp @ 120V AC	304 Stainless Steel	Wire Leads	1/2	NPT	Male	46815K14	000000
										F	1	NPT	Male	0.9	900 psi @ 70° F	-40 to 300	4 1/8"	1 Off or 1 On	SPDT	0.17 amp @ 120V AC	316 Stainless Steel	Wire Leads	1/2	NPT	Male	46815K12	000000




												Brass Body

												E	1	NPT	Male	0.8	150 psi @ 70° F	-40 to 180	3 7/8"	1 Off or 1 On	SPDT	0.17 amp @ 120V AC	Buna-N	Wire Leads	1/2	NPT	Male	5126K19	000000

Through-Wall Horizontal-Mount Float Switches for Fuels and Oils

Mount these switches through an unthreaded hole in your tank wall and secure with a nut from outside the tank. They activate process equipment such as pumps or motors when the diesel fuel, hydraulic fluid, or oil level in your tank reaches the float.

	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Electrical Connection	Includes		Each
120V AC/240V AC Input Voltage







	Polybutylene Body and Float

	5/8"	0.85	100 psi @ 70° F	-40 to 145	2 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.28 amp @ 120V AC	Through Wall	Wire Leads	Mounting Nut	50205K33	000000

Vertical-Mount Compressed-Air Float Switches for Fuels and Oils

Mount these switches through the top of your tank. They actuate with a compressed air valve instead of an electrical signal. The air valve opens when diesel fuel, hydraulic fluid, oil, or water moves the float.

Pipe											Air
Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Mounting Location	Air Inlet Pressure, psi	Overall Lg.	No. of Ports	For Tube ID	Gender		Each







			303 Stainless Steel Body and 304 Stainless Steel Float

			1	NPT	Male	0.5	200 psi @ 70° F	35 to 140	3 1/2"	Top	30 to 100	7 5/8"	3	3/32"	Male	3792K42	0000000

Vertical-Mount Hazardous Location Float Switches for Fuels and Oils

For use in locations with flammable gases and combustible dust, these switches are UL listed and CSA certified for Class I, Divisions 1 and 2, Groups C and D; and Class II, Divisions 1 and 2, Groups E, F, and G. Mount them vertically through the top of your tank. They're rated NEMA 4 for protection from washdowns.

	Pipe											Float			Conduit
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Lg.	Dia.	Electrical Connection	Trade Size	Thread Type	Gender	Certification		Each
120V AC/240V AC Input Voltage







				316 Stainless Steel Body and Float

				1 1/2	NPT	Male	0.7	100 psi @ 70° F	35 to 275	9 1/4"	1 Off or 1 On	SPDT	10 amp @ 120V AC	Top	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	UL Listed, CSA Certified, FM Approved	4914K97	000000000

Vertical-Mount Float Switches with Bracket for Fuels and Oils

Use the included bracket to mount these switches to the inside of your tank. They activate process equipment such as pumps or motors when the diesel fuel, hydraulic fluid, or oil level in your tank reaches the float.

												Mounting
	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Overall Dia.	Electrical Connection	Fasteners Included	No. of Holes	Hole Dia.		Each
120V AC/240V AC Input Voltage







				Buna-N Float

				0.55	150 psi @ 70° F	35 to 140	3 3/16"	1 Off	SPST-NO	0.17 amp @ 120V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	4879K21	0000000


				0.55	150 psi @ 70° F	35 to 140	3 3/16"	1 Off	SPST-NO	0.4 amp @ 120V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	4879K25	000000
				0.55	150 psi @ 70° F	35 to 140	3 3/16"	1 On	SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	4879K23	000000
				0.55	150 psi @ 70° F	35 to 140	3 3/16"	1 On	SPST-NC	0.4 amp @ 120V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	4879K27	000000

Horizontal-Mount Compressed-Air Float Switches for Fuels and Oils

Install these switches through a tank wall. They actuate with a compressed air valve instead of an electrical signal. Use them with diesel fuel, hydraulic fluid, oil, and water.

Fail-Open Valve—For switches with a fail-open valve starting position, the air valve closes when liquids move the float.

Fail-Closed Valve—For switches with a fail-closed valve starting position, the air valve opens when liquids move the float.

	Pipe											Air
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Air Inlet Pressure, psi	Float Material	Overall Lg.	No. of Ports	For Tube ID	Gender		Each
303 Stainless Steel Body







				Fail-Open Valve

				1	NPT	Male	0.5	200 psi @ 70° F	35 to 120	2 7/8"	30 to 85	304 Stainless Steel	6 7/8"	3	3/32"	Male	3792K51	0000000




						Fail-Closed Valve

						1	NPT	Male	0.5	200 psi @ 70° F	35 to 120	2 7/8"	30 to 85	304 Stainless Steel	6 7/8"	3	3/32"	Male	3792K41	000000

Horizontal-Mount Hazardous Location Float Switches for Fuels and Oils


Style A	Style B

Style C

Designed for use in areas where flammable substances are present, these switches are CSA certified for hazardous locations. Mount them through a tank wall. All are rated NEMA 4 for protection from washdowns. All are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” or from “on” to “off”.

Switches with a stainless steel body are more corrosion resistant than switches with a brass body.

		Pipe									Conduit
	Style	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Current @ Voltage	Float Material	Trade Size	Thread Type	Gender	Hazardous Location Rating	Enclosure Rating		Each
120V AC/240V AC Input Voltage







				Brass Body

				A	1	NPT	Male	0.7	350 psi @ 70° F	0 to 220	1 3/4"	5 amp @ 120V AC	304 Stainless Steel	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K12	0000000


				B	1	NPT	Male	0.5	200 psi @ 70° F	0 to 220	2 7/8"	5 amp @ 120V AC	304 Stainless Steel	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K11	000000
				C	1 1/2	NPT	Male	0.7	100 psi @ 70° F	0 to 275	13 3/16"	10 amp @ 120V AC	316 Stainless Steel	3/4	NPT	Female	NEC Class I Divisions 1, 2 Groups C, D NEC Class II Divisions 1, 2 Groups E, F, G	IP56 NEMA 4	4914K86	000000




						303 Stainless Steel Body

						B	1	NPT	Male	0.5	200 psi @ 70° F	0 to 220	2 7/8"	5 amp @ 120V AC	304 Stainless Steel	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K13	000000




								316 Stainless Steel Body

								C	1 1/2	NPT	Male	0.7	100 psi @ 70° F	0 to 275	13 3/16"	10 amp @ 120V AC	316 Stainless Steel	3/4	NPT	Female	NEC Class I Divisions 1, 2 Groups C, D NEC Class II Divisions 1, 2 Groups E, F, G	IP56 NEMA 4	4914K87	00000000