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. They are available in 1-inch (25mm) through 10-inch (250mm) pipe sizes and are made for use on plain end pipe, regardless of pipe wall. Other features include self-grounding, vibration resistant, externally leakproof, with an extremely high end pull for difficult applications. No machining or grooving is required to maintain pipe integrity.