I need to find a source for a replacement float switch for my holding tank. It threads into the threaded plastic cover plate on top of the tank and appears to have 3/8-inch threads. It looks like the Sealand holding tank level switches pictured on the Sealand cover plate shown in the West Marine catalog. I didn't see any individual replacement parts either in the WM catalog or on the Sealand website. Rich Gano CALYPSO (GB-42 #295) Southport, FL