Valterra's Flanged Valve Fitting with Double Sanitary "T" Connector connects grey-water and black-water waste valves, combining them into one waste pipe with its T-configuration. The dimensions of this item are as follows: 3" hub x 1-1/2" hub x 3" bayonet lug fitting. Installation is easy, the 3" hub slides onto the black-water line, the 1-1/2" hub slide over the grey-water line, and the 3" lug fitting connects the sewer hose. During installation, position each valve at your desired angles. The bayonet-style cap covers the lug fitting when it is not in use. This valve fitting is made of durable ABS plastic construction. Hardware is not included with this product. ABS solvent cement is required for installation and is sold separately.