... , BS, JIS, EN, JB, GB, HG, UNI, API CS,SS... high pressure flang Technics: Forged Size: from 1/2 to 200 inch ... ; easy to separate and check the situation of pipe line; easy to seal pipe line, such as oil, petroleum, gas, chemical industry ... : Using Veneer Case or Plywood Case Of Outside, Linoleum And Plastic Cloth Of Inside Dampproof, or other methods according to the ...