ASME B16.29 pdf download WROUGHT COPPER AND WROUGHT COPPER ALLOY SOLDER JOINT DRAINAGE FITTINGS – DWV 6 MARKING Each fitting shall be marked permanently and legibly with the manufacturer’s name or trademark and with DWV (to indicate drain-waste-vent). 7 MATERIAL Fittings shall be made of wrought copper or wrought copper alloy material having not less than an 84% copper content....