At of the lawn mower season if your lawmnower has a shut-off valve on the fuel line, turn off the valve and run the engine until it quits. This assure all the fuel is used up in the carburetor before storing. If the lawnmower has no shut off valve on the fuel line, consider installing one, otherwise drain the tank and run the engine until it uses all the fuel before storing. Also use a shut off valve as a safety feature during the season when storing equipment in a garage or storage building between mowings. It helps with fuel leaks due to a bad needle valve or leaking carburetor. Fuel Shut Off Valve For 1/4 inch Fuel Line Compatibility: Replacement For 698181, 494769, 494539 35857, 32961 For & Stratton 3.5 & 10.5 Industrial Plus-Tec 3.5-5HP For Inlet/Outlet for 1/4Inch ID Fuel Line Replace part # 7-02341 For 494768,493960 and 698183,698181,697947,5019H,5019K For AM36141,AM107340 For 24507, 34212 and 7034212,1-6325 For Toro 54-3150,1-603770 PN: 5841-1/5905-1TECUMSEH # 35857 ROTARY # 9294 Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The picture is a high-resolution rendering.The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic Package Contents: 10 * Shut-Off Valves Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.