Protection from water and dust for an Ikelite electrical bulkhead as found on housings and strobes. Use whenever you don't have a sync cord attached.
This is the correct replacement part for nickel plated brass bulkheads featured on housings and strobes produced through August 2018. Nickel plated brass bulkheads are silver in color.
For hard anodized aluminum bulkheads, use the Waterproof Bulkhead Cap (Aluminum) # 9104.7 instead. Hard anodized aluminum bulkheads are black in color.