drive flang Size: from 1/2 to 200 inch (DN15-DN6000) ... , DIN, BS, JIS, EN, JB, GB, HG, UNI CS,SS... drive flang Technics: Forged Size: from 1/2 to 200 inch ... separate and check the situation of pipe line; easy to seal pipe line, such as oil, petroleum, gas, chemical industry, nuclear ...