Mechanical HDPE couplings offer a cost-effective, fast and easy way to join high density polyethylene pipe and fittings. Munro HDPE couplings 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 coupling uses 4 high-quality bolts and flanged nuts or washers for improved tightening and holding.