Tecmark Pressure Switch [3903-DF Adj SPST] (3903-DF) aquasun or worn beyond service use

or worn beyond service use

Helps restore larger trim presence and style continuity

When a topside panel becomes unreadable

The white 5-scallop design gives this Waterway part a decorative but still clean appearance

Tecmark Pressure Switch [3903-DF Adj SPST] (3903-DF) aquasun or worn beyond service useTecmark 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