Watco 38516-CP Push Pull Replacement Stopper with 5/16 & 3/8 Pins, Chrome Plated Theft-resistant, brass stopper - Designed for heavy-duty use Replaceable, drip-proof Buna-N-Seal - Patents: U.S. Pat. No. 4,720,877 Operation: Push down to close. Pull to open. No stopper rotation required Pin sizes 5/16 & 3/8.Do not order for other pin sizes