https://www.mccoys.com/shop/p/6498315-052303-30/arnold-gc-134-gas-cap
1-3/4 in Dia vented high dome gas cap with liner. Fits Briggs & Stratton 3.5 to 6 hp. Quantum series engines, Max series and Europa series engines. Replaces Briggs & Stratton No 397974.
Suitable for
Briggs & Stratton 3.5 to 6 hp Quantum Series Engines, Max Series Engines and Europa Series Engines