galvanized steel tube flang Size: from 1/2 to 200 inch ... BS, JIS, EN, JB, GB, HG, UNI, API galvanized steel tube flang Technics: Forged Size: from 1/2 to 200 inch ... : Equal Usage: connecting pipe line and keep its leakproofness; convenient for replacing pipe line; easy to separate and check ... the situation of pipe line; easy to seal pipe line, such as oil, petroleum, gas, chemical ...