High tightness (Leakproofness class - A acc. EN - 12266 - 1), Compact settlement, Environment - friendly, Tests acc. EN - 12266 - 1, Flanges drilled according to EN 1092 - 2 for gray & nodular cast iron body,Flanges drilled according to EN 1092 - 1 for cast steel body, Face-to-face dimension according to EN 558 - 1