Skeleton Key Gas/Oil Cap & Bung from Seven Sins Choppers.
Seven Sins new design for custom tanks; made in both a vented and non-vented version for gas and oil tanks. Its flush-mount and a screw-in style, sold in brass, steel or aluminum caps. Inspired by old antique locks from the 13th century when scurvy pirates roamed the seas. Bungs come in mild steel or aluminum. Caps are 1 5/8" in diameter and made with advanced precision mills and lathes. The edges of caps are knurled for extra grip. Designed by David Ryan of VIISC.