Intermatic P1121 15A Outdoor Timer with Cover (P1121) pumpparts and this Maytronics Dolphin Diagnostic

and this Maytronics Dolphin Diagnostic version uses the 6101610 reference

Part number: SPX5500EA

The threaded format helps preserve correct compatibility

a properly working return-line check valve can contribute to cleaner hydraulic behavior and a more predictable equipment response

and this white version uses the 004-577-5020-01 reference

Intermatic P1121 15A Outdoor Timer with Cover (P1121) pumpparts and this Maytronics Dolphin DiagnosticThe Intermatic P1121 15A Outdoor Timer with Cover is a plug in style timer designed for compatible outdoor equipment and accessory scheduling. It provides automatic on off control for supported loads and includes a protective cover for suitable outdoor use. This timer is useful for applications that need simple, repeatable scheduling without a hardwired control panel. Before use, confirm the connected load does not exceed the timer rating and that the