The Stovebolt Site Forums The Parking Lot Big Bolts Brakes with hydrovac 1.5 ton

This is my first post so please don't bust my chops and make me cry. I'm rebuilding a 46 1.5 ton.I've gone through the engine and 90% finished with the braking system.I recently recieved a rebuilt hydrovac from Jim Carters and they sent me this small white PLASTIC ck valve.My old ck valve is fine except for a couple washer-like parts inside.I would rather use the orig parts if at all possible.Any help out there.THANKS