Plastic Trends Inc., of Shelby Township, Mich., has injection molded large diameter DWV test tees in 10?? and 12?? in diameter. Perfect Fit™ DWV test tees feature the most compact branch in the industry. They are commonly used in DWV systems around columns or in raceways. It’s in these areas that space is often a critical factor. Because of that, the company designed a product that makes installation and testing of the system quicker, easier and less costly. They are offered with both raised and countersunk plugs.