Chrome plated bronze cap with o-ring and retainer. Cap has slot between the holes. Perko's history of commitment to quality products and increased customer satisfaction have brought about many innovations in product design and manufacturing. We intend to continue this tradition of quality, efficiency and service, providing increased benefits to our customers for many years to come. Perko's product line consists of over 1,000 individual products with over 5000SKU's. The line includes L.E.D. and incandescent navigation lights, battery switches, searchlights, underwater hardware, cabinet hardware, deck hardware, cleats, locks, latches, hinges, hasps, deck plates and fills, fishing rod holders and emissions products for marine fuel systems.