This Brass Craft brand 3/8 in. Compression/Push x 3/8 in. Compression/Push Straight Push Fitting is perfect for your project. With no tools or tube inserts required, it is suitable for both do it yourselfers and pros, alike. Use this product with instrumentation, hydraulic and pneumatic systems. Use it to connect to copper, PEX and other good quality plastic tubing. It is crafted to endure 150 psi at 70��F and 60 psi at 140��F.