Diesel Fuel Floats | McMaster-Carr

Clear All

	For Use With For Use With	Show

Diesel Fuel

	For Use With For Use With	Hide

Warning: Products have one, but not necessarily all, of the selected characteristics.

	Mounting Orientation Mounting Orientation

Vertical

Horizontal

	Float Material Float Material

Plastic

Stainless Steel

Rubber

	Pipe Size Pipe Size

	Input Voltage Input Voltage

120V AC

240V AC

	Insertion Depth Insertion Depth

	Maximum Temperature Maximum Temperature

	Stem Material Stem Material

Plastic

Stainless Steel

Brass

	Connection Type Connection Type

Pipe

Conduit

Air

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

1 On (Normally Closed)

1 Off (Normally Open) or 1 On
(Normally Closed)

	Mounting Location Mounting Location

Top

Bottom

	Electrical Connection Type Electrical Connection Type

Wire Leads

Spade Terminals

	Mount Type Mount Type

Screw

Through Wall

Bracket

	Industry Designation Industry Designation

SPST-NO

SPST-NC

SPDT

	Thread Type Thread Type

NPT

	Maximum Pressure Maximum Pressure

	Gender Gender

Male

Female

	Body Material Body Material

Plastic

Stainless Steel

Brass

	Minimum Temperature Minimum Temperature

-49° to -25° F

-24° to 0° F

25° F or greater

	Minimum Specific Gravity Minimum Specific Gravity

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Application Application

Signal

	Current Current

View catalog pages (4)

Forward

How can we improve?

33 Products

About Float Switches

Float Switch

Float Switch With Splash Guard

Mount these switches from outside the tank through a threaded connection. 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 the switch with a stainless steel float for durability in harsh conditions.

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

For technical drawings and 3-D models, click on a part number.

120V AC/240V AC Input Voltage
Pipe Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Current	Mounting Location	Float Ht.	Overall Dia.	Electrical Connection		Each
Buna-N Rubber Float
1/8	NPT	Male	0.45	150 psi @ 70° F	35° to 250°	1 9/16"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.17 A @ 120 V AC	Top, Bottom	1"	1"	Wire Leads	00000000	000000
1/8	NPT	Male	0.55	150 psi @ 70° F	35° to 145°	1 7/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Top, Bottom	1"	1"	Wire Leads	00000000	00000
1/4	NPT	Male	0.55	150 psi @ 70° F	35° to 145°	2 7/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.5 A @ 120 V AC	Top, Bottom	2"	1 1/4"	Wire Leads	00000000	00000
Buna-N Rubber Float with Splash Guard
1/8	NPT	Male	0.55	150 psi @ 70° F	35° to 145°	1 7/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Top, Bottom	1"	1 1/2"	Wire Leads	00000000	00000
1/4	NPT	Male	0.55	150 psi @ 70° F	35° to 145°	2 7/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.5 A @ 120 V AC	Top, Bottom	2"	2"	Wire Leads	00000000	00000
316 Stainless Steel Float
1/8	NPT	Male	0.7	300 psi @ 70° F	35° to 300°	2 1/16"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.5 A @ 120 V AC	Top, Bottom	1 3/16"	1 1/8"	Wire Leads	0000000	00000

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.

For technical drawings and 3-D models, click on a part number.

											Overall
Pipe Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Current	Float Ht.	Ht.	Dia.	Electrical Connection		Each
120V AC/240V AC Input Voltage
Buna-N Rubber Float
2	NPT	Male	0.55	150 psi @ 70° F	35° to 180°	33 1/2"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.17 A @ 120 V AC	1 11/16"	35"	1 7/8"	Wire Leads	0000000	0000000
316 Stainless Steel Float
2	NPT	Male	0.75	750 psi @ 70° F	35° to 275°	34"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.17 A @ 120 V AC	2"	35 1/2"	2 1/16"	Wire Leads	0000000	00000000

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.

For technical drawings and 3-D models, click on a part number.

											Mounting
Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Current	Mounting Location	Float Ht.	Overall Dia.	Electrical Connection	Fasteners Included	No. of Holes	Hole Dia.		Each
120V AC/240V AC Input Voltage
Buna-N Rubber Float
0.55	150 psi @ 70° F	35° to 140°	3 3/16"	1 Off (Normally Open)	SPST-NO	0.17 A @ 120 V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	0000000	0000000
0.55	150 psi @ 70° F	35° to 140°	3 3/16"	1 Off (Normally Open)	SPST-NO	0.4 A @ 120 V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	0000000	000000
0.55	150 psi @ 70° F	35° to 140°	3 3/16"	1 On (Normally Closed)	SPST-NC	0.17 A @ 120 V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	0000000	000000
0.55	150 psi @ 70° F	35° to 140°	3 3/16"	1 On (Normally Closed)	SPST-NC	0.4 A @ 120 V AC	Top, Bottom	1 9/16"	2 5/8"	Wire Leads	No	2	9/32"	0000000	000000

Horizontal-Mount Float Switches for Fuels and Oils

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.

Switch with splash guard minimizes false switch activation caused by splashing liquid.

For technical drawings and 3-D models, click on a part number.

	Pipe												Conduit
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Current	Float Material	Electrical Connection	Trade Size	Thread Type	Gender		Each
120V AC/240V AC Input Voltage
Polybutylene Plastic Body
A	1/2	NPT	Male	0.85	100 psi @ 70° F	-40° to 145°	2 3/4"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Polybutylene Plastic	Spade Terminals	__	__	__	00000000	000000
A	1/2	NPT	Male	0.85	100 psi @ 70° F	-40° to 145°	2 3/4"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Polybutylene Plastic	Wire Leads	__	__	__	00000000	00000
A	1/2	NPT	Male	0.85	100 psi @ 70° F	-40° to 145°	2 3/4"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Polybutylene Plastic	Wire Leads	1/2	NPT	Male	00000000	00000
Polybutylene Plastic Body and Splash Guard
B	1	NPT	Male	0.85	100 psi @ 70° F	-40° to 145°	1 7/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Polybutylene Plastic	Spade Terminals	__	__	__	00000000	00000
PPS Plastic Body
A	1 1/4	NPT	Male	0.7	200 psi @ 70° F	-40° to 190°	4 1/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.5 A @ 120 V AC	PPS Plastic	Wire Leads	__	__	__	0000000	00000
C	1 1/4	NPT	Male	0.7	100 psi @ 70° F	32° to 190°	4 13/16"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	15 A @ 120 V AC	PPS Plastic	Wire Leads	__	__	__	0000000	000000
316 Stainless Steel Body
D	1/2	NPT	Male	0.55	100 psi @ 70° F	-40° to 225°	3 11/16"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.17 A @ 120 V AC	Polypropylene Plastic	Wire Leads	1/2	NPT	Male	00000000	000000
D	1/2	NPT	Male	0.65	100 psi @ 70° F	-40° to 250°	3 11/16"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.17 A @ 120 V AC	Nylon Plastic	Wire Leads	1/2	NPT	Male	0000000	000000
E	1	NPT	Male	0.85	500 psi @ 70° F	-40° to 300°	5 5/16"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	0.17 A @ 120 V AC	304 Stainless Steel	Wire Leads	1/2	NPT	Male	00000000	000000
F	1	NPT	Male	0.9	900 psi @ 70° F	-40° to 300°	4 1/8"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	0.17 A @ 120 V AC	316 Stainless Steel	Wire Leads	1/2	NPT	Male	00000000	000000
Brass Body
E	1	NPT	Male	0.8	150 psi @ 70° F	-40° to 180°	3 7/8"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	0.17 A @ 120 V AC	Buna-N Rubber	Wire Leads	1/2	NPT	Male	0000000	000000

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

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

For technical drawings and 3-D models, click on a part number.

120V AC/240V AC Input Voltage
For Hole Dia.	Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Current	Float Material	Electrical Connection	Includes		Each
Polybutylene Plastic Body
5/8"	0.85	100 psi @ 70° F	-40° to 145°	2 7/8"	1 Off (Normally Open)/1 On (Normally Closed)	SPST-NO SPST-NC	0.28 A @ 120 V AC	Polybutylene Plastic	Wire Leads	Mounting Nut	00000000	000000

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

Mount this switch through the top of your tank. It actuates 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.

For technical drawings and 3-D models, click on a part number.

Pipe											Air
Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	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
1	NPT	Male	0.5	200 psi @ 70° F	35° to 140°	3 1/2"	30-100	304 Stainless Steel	7 5/8"	3	3/32"	Male	0000000	0000000

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.

For switches with a normally open valve starting position, the air valve closes when liquids move the float.

For switches with a normally closed valve starting position, the air valve opens when liquids move the float.

For technical drawings and 3-D models, click on a part number.

Pipe											Air
Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	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
Normally Open
1	NPT	Male	0.5	200 psi @ 70° F	35° to 120°	2 7/8"	30-85	304 Stainless Steel	6 7/8"	3	3/32"	Male	0000000	0000000
Normally Closed
1	NPT	Male	0.5	200 psi @ 70° F	35° to 120°	2 7/8"	30-85	304 Stainless Steel	6 7/8"	3	3/32"	Male	0000000	000000

Vertical-Mount Hazardous Location Float Switches for Fuels and Oils

For use in locations with flammable gases and combustible dust, this switch is 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 it vertically through the top of your tank. It’s rated NEMA 4 for protection from washdowns.

For technical drawings and 3-D models, click on a part number.

Pipe											Float			Conduit
Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Current	Float Material	Lg.	Dia.	Electrical Connection	Trade Size	Thread Type	Gender		Each
120V AC/240V AC Input Voltage
316 Stainless Steel Body
1 1/2	NPT	Male	0.7	100 psi @ 70° F	35° to 275°	9 1/4"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	10 A @ 120 V AC	316 Stainless Steel	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	0000000	0000000

Horizontal-Mount Hazardous Location Float Switches for Fuels and Oils

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” (normally open) or from “on” to “off” (normally closed).

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

For technical drawings and 3-D models, click on a part number.

	Pipe									Conduit
Style	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure	Temp. Range, °F	Insertion Dp.	Current	Float Material	Trade Size	Thread Type	Gender	Environmental 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 A @ 120 V 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	0000000	0000000
B	1	NPT	Male	0.5	200 psi @ 70° F	0° to 220°	2 7/8"	5 A @ 120 V 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	0000000	000000
C	1 1/2	NPT	Male	0.7	100 psi @ 70° F	0° to 275°	13 3/16"	10 A @ 120 V 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	0000000	000000
303 Stainless Steel Body
B	1	NPT	Male	0.5	200 psi @ 70° F	0° to 220°	2 7/8"	5 A @ 120 V 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	0000000	000000
316 Stainless Steel Body
C	1 1/2	NPT	Male	0.7	100 psi @ 70° F	0° to 275°	13 3/16"	10 A @ 120 V 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	0000000	000000