Iron or steel refrigerant piping 1.5″ nominal size and smaller and containing liquid refrigerant shall have a min. wall thickness not less than that specified in UMC Table 15-1, Table 15-1A for Schedule 80 pipe or____.

Iron or steel refrigerant piping 1.5″ nominal size and smaller and containing liquid refrigerant shall have a min. wall thickness not less than that specified in UMC Table 15-1, Table 15-1A for Schedule 80 pipe or____.