These ring grip pipe and tube 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 in. (25 mm) through 10 in. (250 mm) pipe sizes and are made for use on plain end pipe or tube, regardless of pipe or tube wall thickness. The couplings are self-grounding, vibration-resistant and externally leak-proof, with a high-end pull for difficult applications.