Tecmark Model 3903 Pressure Switch , 1Amp power rating 1/8MPT screw thread to attach to heater tubes, fitted with 2 x quick connect terminals for the electrical connection

1-5 psi 7-35kpa adjustable SPST.

this is a very common Pressure switch, may be used in the following heaters:

Balboa , Davey , Spa-Quip , Spa Builbers , HydroQuip , and other

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