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 hard anodized aluminum bulkheads featured on housings and strobes produced September 2018 and later. Hard anodized aluminum bulkheads are black in color.
For nickel plated brass bulkheads, use the Waterproof Bulkhead Cap (Brass) # 9104.5 instead. Nickel plated brass bulkheads are silver in color.