Tuf-Lok ring grip pipe and tube couplings are low cost, heavy duty and self-aligning, designed for either high pressure, to 150 psig, or full vacuum-rated applications. They are available in 1-in. through 10-in. pipe sizes and are made for use on plain-end pipe or tube, regardless of pipe or tube wall thickness. They are self-grounding, vibration resistant and externally leakproof, with high end pull for difficult applications. No machining or grooving is required to maintain pipe or tube integrity.