Lawn Tractor Fuel Tank Check Valve Grommet. This fuel tank check valve grommet (part number 735-04081) is for lawn tractors.Fuel tank check valve grommet 735-04081 connects the check valve to the fuel tank.Drain the gas tank before installing this part. Wear work gloves to protect your hands a... - Lawn Tractor Fuel Tank Check Valve Grommet.