DD Strainers Home » Products » DD Strainers Indirect waste hub strainers with 4″ N.P.S.M. machined threads. Available in either cast iron (illustrated below), nickel bronze and /or Type 304 stainless steel. Catalog Catalog List Pricing Current Catalog: MPB-2022 Downloads Downloads Features & Benefits Typical Installations Outlet Selection Guide All Star Cover Flyer Drain Specifications Videos Videos Top Set Drain Demonstration All-Star Drain Video Return to Products