6 quick release flange couplings made of metal; gaskets and seals made of metal for use in the field of vacuum technology, semiconductor processing, high energy physics, chemistry and cryogenic technology; metal pipe and hose fittings, namely, flanges, elbows, tee fittings, and cross fittings; flexible bellows type pipes and hoses made of metal; metal hoses and metal hose diameter reducing fittings for use in the fields of vacuum technology, semiconductor processing, high energy physics, chemistry and cryogenic technology