Fuel Tank Cap for Briggs & Stratton Engines. Brand new, premium quality compatible fuel tank cap f...Fuel Tank Cap for Briggs & Stratton Engines. Brand new, premium quality compatible fuel tank cap for Briggs & Stratton engines. Dimensions: Internal Thread: 42mm (Approx.) Diameter: 45mm (Approx.) Height: 19mm (Approx.) External Width: 53mm (Approx.). Equivalent MPNs: 397974, 5044, 5044B, 5044D, 5044H, 5044K, 493017 692046, 793606, 796577. Fits Models: FOR BRIGGS & STRATTON 3.5HP, 5HP, 6HP Quantum, Max, Europa Vertical Engines. If unsure please check images match your fuel cap before purchasing. Suitable for Briggs & Stratton engines with 42mm fuel filler neck only. Please note: all dimensions in.