Dresser Style 64 Riser Tees are designed to provide a flexible, low-cost method of making gas service connections of deeply buried mains, thus saving on excavation costs. With the unique combination of compression end components, the Style 64 is designed as a seal and restraint connection. This gripping action increases as the pipe attempts to pull out of the coupling. Proper insert stiffeners for P.E. pipe provided by Dresser.