Mechanical HDPE transition fittings are an ideal solution to join high density polyethylene pipe with grooved steel pipe. Munro HDPE transition fittings offer a lighter, easier to handle design with sharp, well-defined teeth for maximum penetration and grip. Engineered to satisfy the working pressure of DR 7.3 to DR 32.5, every Munro HDPE transition fitting uses four high-quality bolts and flanged nuts or washers for improved tightening and holding.