Hydraulic adaptors with male or female threads are widely used as connection or reduction parts of hydraulic hose assemblies, quick release couplings, valves, actuators and other elements in hydraulic systems. Connection is sealed with the use of PTFE tape, dowty seals, metal to metal, etc. Available in zinc plated carbon steel or stainless steel version as straight connectors, elbows, tees, crosses, plugs, etc.