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Pneumatic systems benefit from push-to-connect tube fittings such as the union tee fitting. Its compact, durable design allows for three connections in a small package and is suitable for copper or plastic tubing only (not recommended for steel or stainless steel). The 1/8 OD size makes it ideal for applications requiring precise, leakproof connections that are simple to assemble without the need for welding or soldering. Perfect for compressed air systems and vacuum systems, the union tee fitting offers easy installation in tight spaces, making it a popular choice among hobbyists, mechanics, and professionals alike.