... building.The sprinkler is composed of glass ball sprinkler, support ring, casing and cover. The casing and the cover are welded ... vernier caliper 0-500mm 3 2.4 Acceptable Whorl plug gauge M10*1, M16*1.5, M52*2, M30*1.5 ... *1.5, M45*1.5 7 2.4 Acceptable Whorl ring gauge M10*1,M16*1.5, M52*2, M30*1.5 ...