This fuel tank cap is engineered for compatibility with 168F/170F recoil start gasoline engines. Its function is to seal the fuel tank, preventing leaks, while also providing essential venting for proper fuel flow to the engine. The cap is constructed from mild steel and plastic components and features a round, flanged design with a threaded attachment mechanism. The cap's primary purpose is to secure the fuel, prevent contamination, and maintain adequate tank ventilation to support optimal engine operation.