Description: This is a outboard engine oil tank cap with a regular thread. Aftermarket item, good for working out leaks or faults. Thermal insulation, light weight, and strong rigidity. Easy installation, no instruction included. Fitment: for Universal 2 Storke 4HP 5HP 6HP Outboard Engine Specification: Color: Black Material: ABS Plastic Inner Diam: 4.2 cm / 1.65 inch Outer Diam: 7.2 cm / 2.83 inch Height: 3.5 cm / 1.38 inch Package Includes: 1 Piece Tank Gas Cap Note: Please allow slightly difference due to manual measurement. Color may be slightly different from the pictures because of different screen and light. Please kindly understand