... They are flexible rubber joints, reduced rubber joints, rubber elbows, fan coil joint, sewage check valve rubber, rubber filter, rubber compensator air ... , oil, acid and alkali. Special type used to transport -30--250 centigrade over the medium or oil, strong alkali acid ... 100(750)Tempreture-15~115special customer made could reach to -30--250Mediaair ,compressed air,water,sea water,oil,acid,alkali etc ...