This part is a replacement fuel cap. It is intended for use with generators. Fuel caps are intended to prevent gas spills and leaks, as well as stop contaminants from entering the fuel supply. If the fuel camp is lost or broken, it should immediately be replaced with a genuine OEM part. When working on or near an engine, always ensure that the equipment is powered off and completely cool before beginning any repairs.This fuel cap is suitable for use on generators manufactured by Generac, Honeywell, Siemens, and some other brands. It is a genuine OEM part from Generac and thus is made of high-quality, durable materials. It is sold individually.