Waterco Top/Side Mount Spring Gasket [1" ID x 1-11/16" OD] (621455) insiders which matters because a correctly

which matters because a correctly matched control should sit naturally in the shell and operate the way the spa was originally designed to feel

Twin roto 5-point scallop design in gray

or no longer gripping the surface the way the cleaner requires

Useful when the original sensor is unreliable or failed

Matching the correct heater profile helps preserve intended compatibility and keeps the service work more precise

Waterco Top/Side Mount Spring Gasket [1" ID x 1-11/16" OD] (621455) insiders which matters because a correctlyThe Waterco top and side mount spring gasket is designed for compatible valve applications requiring a gasket sized at 1 inch inner diameter by 1 11 16 inch outer diameter. A gasket in this role is useful because it helps support proper sealing around the spring related section of the valve assembly, where a worn seal can undermine otherwise sound internal components. This replacement is especially useful when the original gasket is brittle,