Metal couplings for use with hose, pipe, and storage tanks; Metal fittings for hose, pipe, and storage tanks; Metal cam and groove couplings for use in the transfer of flowable materials; Quick connect metal couplings for use with flexible pressure hoses in the transfer of flowable materials; Metal couplings for use with flexible pressure hoses for use in the transfer of flowable materials; Metal safety couplings for use with flexible pressure hoses for use in the transfer of flowable materials