Wall Fitting, CMP, 1-1/2fpt x 2 Insider, 3-1/2fd, White. Wall Fitting, CMP, 1-1/2″fpt x 2″ Insider, 3-1/2″fd, White. Manufacturer Custom Molded Products. Thread Size 1 to 1/2. Thread Type NPTF. Connector Type Threaded Fitting.