Tuf-Lok International manufactures a complete line of pipe and tube couplings for almost any industry. Tuf-Lok pipe and tube couplings are available with a tough zinc plating in standard sizes from 1 inch (25 mm) through 10inch (250mm). All couplings are rugged and heavy duty, with a special self-aligning feature, excellent for pneumatic conveying systems or general piping. Couplings are full vacuum rated up to 150 psig with a self-grounding feature with high end pull. Standard couplings are rated up to 350 F (177 C). Also available in an optional high temperature design of 400 F (204 C).