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By certification 
Characteristics:
1) Designed according to ANSI, DIN and BS.
2) Type: single sphere joint flange type, twin sphere joint flange type, twin sphere joint union type.
3) Main body: EPDM, NBR, neoprene.
4) Lining: chinlon cord fabrics.
5) Frame: hard steel wires.
6) Flange: carbon steel.
7) Union: malleable iron.
8) We can also supply stainless steel joint
