Tecmark Pressure Switch [3903-DF Adj SPST] (3903-DF) NuWhirl Helps manage flow through the

Helps manage flow through the feeder plumbing setup

and this Gecko TSC-8/K-8 version is designed in a 10-button large rectangular LCD format for 3 pump applications using the BDLTSC810K reference

Supports proper matching with S

Waterway Crystal Water long elbow

The white finish keeps the replacement bright and easy to blend into many spa interiors and shell colors

Tecmark Pressure Switch [3903-DF Adj SPST] (3903-DF) NuWhirl Helps manage flow through theTecmark Pressure Switch [3903 DF Adj SPST] (3903 DF) is a Tecmark replacement pressure switch used in compatible spa and hot tub control systems. Pressure switches help monitor water flow or pressure conditions so equipment can operate with the intended safety logic and control response. A failing or mismatched pressure switch can contribute to heating errors, equipment interruptions, or unreliable system operation. This replacement is intended for