Ready to use|Over 1,000 composite push-in pneumatic fittings|Releasable stainless-steel grab-ring to grip nylon or polyurethane tube (85 or 95 durometer)|Nickel plated brass components|Pre applied thread sealant on all taper threads and recessed captive O-ring on parallel threads|Internal and external hexagons on straight fittings|Immediate quality sealing using silicone free U-packing|Mounting holes on all union fittings