310 5/4" Backnut black F

Thread pipe fitting from malleable cast iron, kind – checknut with inner tubular thread, black design. Inner thread G is cylindrical for loose of joints on threads according of norm ISO 228-1. Produced according of norm EN 10242, mark P4. Using: Intended for distribution of water, air, gas, nonabrassive and nonaggressive fluid to allowed press 25 bar and temperature from -20 to 120°C, with necessity of prevention for freezing of media.