This part is a Black Notched 3 3/4" Spa Buttress Diverter Cap only. 

This is a Buttress Cap.

You need to inspect and see if your cap has the word Buttress stamped in it look in the pictures for an example of a Buttress Cap to see where the word buttress can be found. 

If the word Buttress is not found inside your cap you need a Non Buttress style see our store for that style.

This Diverter Cap mounts on top of the Diverter Valve with the Stem sticking through then a handle goes in top of the stem square.

The Diverter Valve that this part fits is used to Divert Water into different sides of a hot tub and fits many different brands. The outside measurement of the Cap is about 3 3/4" the inside thread measurement is about 2 3/4" and the center hole where the stem and o-rings go measures about 3/4".

This listing is for the Cap only all other parts shown are for illustration only and sold separately.

We offer the Cap and Handle in different colors and shapes and the o-rings, Stem and Complete valves & Kits in our Store. 

NOTE: There are times that this kit will not solve the concern of the cap blowing off. If you replace the cap and it continues to blow off you will need to replace the entire valve. We do offer complete valve kits in our store.