Threaded connections composed of two fittings - union nut and socket with inner. Used to connect the pump to the system. Connecting threads G are parallel join for not sealing threads according ISO 228-1. Delivered without flat sealing. Produced according EN 1254-4.Individual parts fitting 351 = 374L + 371Attention: union should use like built-up of complex only, because individual parts of the union with different production marks or individual parts of different types and same production marks can’t be compatible!Using: Fittings are used to transport water, drinking water, air, non-abrasive and aggressive substances with maximum working pressure of 1.6 MPa at a temperature of fluid from 0 ° C to 120 ° C, medium can not freeze.