... :6bar ,8bar, 10bar ,13bar ,16bar The size:1 -6" Fire Couplings,Storz Coupling,fire fighting hose Fire Hose / Rubber lined fire ... used in line of fire fighting, irrig-ation, and construction,water delievery and agriculture...INCHNOMINAL INTERAL DLAMETERACTUAL INTERNAL DLAMETER(M/M ... .56-16bar3"8076.26-13bar4"100101.66-10bar8- fire hose couplings