Tecmark Pressure Switch [3903-DF Adj SPST] (3903-DF) NuWhirl and this generic version is

and this generic version is sized with a 5-7/8 inch inside diameter and 3/16 inch cross-section using the 360-VT75BR reference

The SPX1621C is a practical replacement for compatible Hayward Super Pump systems that need renewed impeller performance and cleaner long-term operation

Useful when replacing a failed original motor while keeping the pump assembly

The Waterway 805-0000 main tank body O-ring is designed for compatible Crystal Water system applications where sealing around the main tank body is critical

Supports proper matching with S

Tecmark Pressure Switch [3903-DF Adj SPST] (3903-DF) NuWhirl and this generic version isTecmark 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