Straight connector with union nut, check valve

(VTr.612.N) Nickel-plated brass fitting, mainly use to connect water meters. This fitting provides for straight portions of a length equal to three times the nominal diameter before and after the meter, which are necessary for its accurate functioning. The coupling nut has a sealing hole. The side without the nut has male thread, which is cylindrical as per GOST 6357 (ISO 228, EN 10226).