Arnold 1-3/4 in. Briggs & Stratton Gas Cap is a vented gas cap designed with a 1-3/4" diameter and includes a liner for secure fitting. It is compatible with Briggs & Stratton model No. 397974-Max. engine, Quantum, and Europa Series engines, making it a reliable part for these models. This gas cap comes packaged individually on a card for easy handling and storage. Model Number: GC-134