The letters DWV stand for drain, waste, and vent—a helpful reminder that DWV pipe is approved for use only in drain and vent lines. As the only copper pipe type not used in water systems. Copper DWV pipe comes in larger diameters than the other types of copper and is distinguished by yellow markings. It also has thinner walls than the other types of copper pipe, with a wall thickness of .040 for a piece of 1¼-inch pipe, the smallest diameter available for DWV. The thin walls on DWV copper pipe can only withstand a maximum pressure rating of 15 psi, hence the narrow range of use.
VMS stocks a wide selection of copper DWV fittings from sizes ranging from 1-1/4” to 2”