This Part is a Wall Fitting Gasket used on Pentair Luxury Micro Jet Body Flanges between the flange and the color side of the hot tub shell.. You use silicon to seal the underside of the shell on the...
Wall Fitting , Pentair, Diverter Jet, 3-Port, Flange
Below is a link to the parts that this flange fits..
Diverter Jet Internal, Pentair 3 Port Diverter, 4-5/8", Face Diameter, Directional, Gray