10-580902-28Z is a protective metal receptacle cap designed for Amphenol ACA-B and GT series reverse bayonet coupling connectors. This cap seals the front of receptacles and includes a chain for retention at the required location. The cap is available in multiple finish options including olive drab cadmium plate, electroless nickel, black zinc cobalt, and gray zinc nickel. For shell size 28, the cap features a diameter (D) of 5.6 mm (+0.5/-0.0), a maximum length (L) of 22.9 mm, and a maximum width (N) of 54.0 mm. These protective caps are essential accessories for maintaining connector integrity and protecting receptacles from contamination and damage during storage, transport, and when not in use.