If you're talking about a thick grey or white piece it goes in the hole the handle screws into it is used to hold the Venturi in placethe handle bottoms on it and pushes it against the venturi jet so it doesn't blow back and outI'm changing out my dema valves on the hydraforce. It comes with a delron washer. Where does it go?
If you look closely inside where the handle goes you'll see the venturi . Its held in with an oring that thick washer is a spacer that holds it in place the handle screws in against itNo, its a thick black washer. Amazon calls it a Delron washer. 1Z0F993R0394448434
The one circled on the right in the pic.