The BrassCraft compression tee is a special fitting designed for joining existing metal and PVC pipes or tubes. Compression tees are primarily used for pipe repairs, compression tees are used to tap a new pipe/tube into an existing one. Machined from brass O.D. Tube, All 3 Ends Designed for use with aluminum and copper tubing. Not recommended for steel tubing For use with potable and non-potable water, instrumentation, hydraulic and pneumatic systems Plastic and PEX tubing installations require sleeves and/or inserts. Check installation instructions for exact requirements Compression fittings do not require flaring, soldering or other types of tube preparation Rough Brass For indoor use Temperature rating: -65° to 250° F at maximum operating pressures Working pressure: 200 psi