Waterco Hydro Pak Skimmer Control Plate Plug w/String (51B1018) floatingfeeders A circuit board like this

A circuit board like this INF107 VS501Z replacement matters because it restores the control behavior the spa was originally built around

1-1/2 inch female pipe thread x 1-1/2 inch slip connection

or no longer produces reliable water heat

Helps seal compatible connection points against leakage

When a tank seal becomes flattened

Waterco Hydro Pak Skimmer Control Plate Plug w/String (51B1018) floatingfeeders A circuit board like thisThe Waterco Hydro Pak skimmer control plate plug with string is designed for compatible skimmer applications where the plug section of the control plate needs replacement. A plug like this is useful because it helps close or regulate the related opening while the attached string adds convenience for handling and retrieval during service. This replacement is especially useful when the original plug is missing, damaged, worn, or no longer fitting