This is to replace the small fuel drain valve you press at the bottom of the carburettor float bowl to drain old fuel or water out of the bowl.
Carburettor Bowl Drain Valve & Seal, Qualcast Classic 35s, 43s Mower AQ148, CP10
Carburettor Bowl Drain Valve & Seal, Webb Diplomat 300, 350, 450 Mower A114 CP10
Canadian Spa Company Drain Valve Cap for Drain Valve KK-10901
Hot Tub Drain Valve Adaptor. Connect Your Hose to Your Spa Drain. USA 3/4 inch
HONDA GC 135 160 GCV135 GCV160 IZY MOWER CARBURETTOR BOWL 'O' RING SEAL GASKET
Carburettor Bowl Gasket Seal For Tecumseh Engine Replaces Part No. 29630076