The Tuf-Lok ring grip pipe couplings are low cost, heavy-duty self-aligning couplings for either high pressure, to 150 psig, or full-vacuum rated applications. These couplings install quickly and easily, reducing installation costs. They are available in 1-in. (25mm) through 10-in. (250mm) pipe sizes and are made for use on plain end pipe, regardless of pipe wall.