Norgren pneufit m0020 series straight union push in fittings metric norgren m00200400 this straight union is from the pneufit m series of metric push in fittings the union is ready to use and enables fast assembly with no need for tools hoses when installed are securely anchored and there is a releasable stainless steel grab ring that grips nylon or polyurethane tube 85 or 95 durometer the fittings have nickel plated brass components that provide corrosion and contamination resistance