From a previous thread on the same topic....
This is the new model floor drain that Grady is now using. It has a built-in ball valve that is supposed to reduce the water back flow. They are a lot more rugged than the older plastic ones without the ball valve. You can also unscrew them for cleaning.
REMOVABLE COCKPIT DRAIN SCUPPER
Stainless Steel 316 Grate & Nylon Adapter
1. Spoke type drain grate designed to maximize water flow. 2. Stainless steel 316 grate screws into nylon body. 3. Inner grate can be removed for cleaning purposes. 4. Incorporates one way check ball to hold water back temporarily.
You can order them through a Grady dealer, but I'm trying to get them directly from the supplier since they are located only a few miles from me. I'll find out today (if they are open) or tomorrow and see if they will sell directly to retail customers.
MARINE TOWN USA
2061 NW US Highway 19,
Crystal River,FL 34428
T352 564 1150
F352 564 1156
E
info@marinetown.com