External-Mount Switches | McMaster-Carr

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6 Products

Horizontal-Mount Float Switches for Water


Polysulfone Body	PPS	303 Stainless Steel Body

Brass Body	304 Stainless Steel Body	316 Stainless Steel Body

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 water level in your tank reaches the float. Some meet European safety standards.

Choose switches with a brass or stainless steel body for durability in harsh conditions.

	Pipe												Conduit
	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	Pipe Size	Thread Type	Gender		Each
120V AC Input Voltage







				303 Stainless Steel Body

				1	NPT	Male	0.7	350 psi @ 70° F	40 to 200	1 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	304 Stainless Steel	Wire Leads	—	1/8	NPT	Male	48255K31	0000000




						Brass Body

						1	NPT	Male	0.9	1,000 psi @ 70° F	40 to 200	1 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	Polypropylene	Wire Leads	—	1/8	NPT	Male	48255K26	000000


						120V AC/240V AC Input Voltage







										Polysulfone Body

										1/2	NPT	Male	0.71	150 psi @ 70° F	-40 to 225	2 11/16"	1 Off/1 On	SPST-NO SPST-NC	0.16 amp @ 120V AC	Polysulfone	Wire Leads	—	—	—	—	49175K37	00000




												PPS Body

												1	NPT	Male	0.6	150 psi @ 70° F	40 to 210	4 3/4"	1 Off or 1 On	SPDT	5 amp @ 120V AC	PPS	Wire Leads	1/2	—	NPT	Male	46235K25	000000




														304 Stainless Steel Body—CE Marked

														1/2	NPT	Male	0.85	360 psi @ 70° F	0 to 250	3 1/4"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	304 Stainless Steel	Wire Leads	1/2	—	NPT	Male	48255K111	00000




																316 Stainless Steel Body

																1	NPT	Male	0.75	1,000 psi @ 70° F	-30 to 300	5"	1 Off or 1 On	SPDT	0.16 amp @ 120V AC	316 Stainless Steel	Wire Leads	1/2	—	NPT	Male	48255K112	000000