The objective of PDI is to promote the advancement of engineered plumbing products through publicity, public relations, research, and standardization of product requirements.

The Plumbing and Drainage Institute (PDI) is a trade association of manufacturers of engineered plumbing products. Our members make many items, including floor drains, roof drains, sanitary floor drains, cleanouts, water hammer arresters, fixture supports, interceptors, grease traps, hydrants and swimming pool drains.