Amphenol USB-C Harsh Environment Dust Caps Dust covers for use with MUSBR series panel mount USB C receptacles. The high temperature silicone rubber dust caps have a brass nickel plated bushing with a 2.57 mm diameter hole for mounting. The dust covers provide extra protection to prevent water and dust ingress when the receptacle is not in use. See part number 124-5631 and range for compatible USB C panel mount connectors.