... used at shock absorber and compensate for displacement.JGD mean single ball (arch),JGD-A dual ball ,JGD-B threaded ... fans and other piping systemsbr> [Media]:Common type used to transport -15 to 120 centigrade, of air, compressed air, water, sea ... Special type used to transport -30 to 250 centigrade of the medium contain oil, strong alkali acid concentration, solid-state materials[Recommendation]Good ...