echnical Data Size DN15-DN50 Face to Face DIN3352 Inspection and Test BS6755 Material of parts Parts Description Material 1 Ball ABS/SS304/SS316 2 Body Ductile Iron(GGG50) 3 Gasket NBR 4 Plate Ductile Iron(GGG50) 5 Air Release Nuts Brass 6 Small Cover Ductile Iron(GGG50)