Pressure Switch - Adjustable, SPST-NO, 3902

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Adjustable Spa Heater Pressure Switch, 3902, SPST-normally open, pilot duty, by Tecmark. ⅛" NPT thread (⅜" actual O.D.) 1-5 PSI adjustable 2-Terminals: NO, common Product Notes: 1A @ 120VAC, 72 VA Pilot Duty @ 24VAC. Equiv. numbers are 3965, 36142, 3902, 3903, 34-0178, 6560-869. Also replaces 510AD0181, 510AD0167, SWPU510AD0064, 800320-3, 800315-3, 12209, 01515-04, RME-PSS-8320, WGK510AD0167. Spa Pressure Switch Adjustment Instructions Show more