ASME B16.23 pdf download Cast Copper Alloy Solder Joint Drainage Fittings: DWV 6 SIZE (a) The size of the fittings scheduled in Tables 6-1 through 6-56 corresponds to the drainage tube size shown in ASTM B306. The size of the threaded ends (except slip joints) corresponds to the nominal pipe size. (b) Fittingsaredesignatedbythesizeoftheopeningsin the sequence illustrated in Figure 6-1. 7...