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.
HONDA GC 135 160 GCV135 GCV160 IZY MOWER CARBURETTOR BOWL 'O' RING SEAL GASKET
Carburettor Bowl Seal Fits Honda G150 G200 G300 G400 GCV160 GCV135 GC160 GC135
Carburettor Bowl Gasket Fits QUALCAST SUFFOLK
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Carburettor Bowl O Ring Gasket Seal Fits Honda GCV135 GCV160 Engine
URPIZY Oil Drain Valve 125-508 for for Cadet 751-10517A Lawn Mower, Riding Lawn Mower, Yard Tractor 125-508, 951-10517A, 181654, 428287, 3/8"-18 NPT