Pneumatic fittings provide the essential link between tubes, hoses and other components in a pneumatic system. Air fittings feature tighter seals and have lower pressure requirements than hydraulic fittings and are typically offered in various connector types. Thread: Coated Threads Fittings with external threads have a sealing layer, so you don't need to use any adhesives Preferred material. Retain tightness automatically after inserting the hose. Finish Resin Lock Claws: Stainless Steel. Fluid: Air - Water - Vacuum. Package Included: 1x Connector Fit For Tube >Material: PU/PE/Nylon, Polyurethane