Gas Fuel Tank Petcock For Honda XL500S-B 500 XL500S 1979 1980 1981 16x1.5mm Aftermarket Petcock Assembly, Please use images as referance Package Includes: Petcock switch, Fuel filter pipe with screens, O-ring seal Petcock positions:ON / RES / OFF Threading 16 x 1.5mm. 22mm Hex nut Free domestic shipping.