This valve cap has been discontinued and we are working on a modern replacement. Until then you can replace the complete valve with ease using one of our waterfall kits. See below

Hot Tub Spa Part Gray Waterfall Valve with (2) Straight Barbs Video How To

Hot Tub Spa Part Gray Waterfall Valve RENU Kit with (3) Straight (1) 90 Barbs Video How To

Hot Tub Spa Part Gray Waterfall Valve RENU Kit with (4) Straight Barbs Video How To

This item is a Gray Notched Replacement Diverter Cap & O-Ring Kit for a 1" Waterfall or Neck Jet Control..

The inside thread measurement is about 1 5/8" and the center hole is about 3/4"..

It uses (2) Small o-rings and one O-Ring Gasket that measures about 1 1/2" center to center..