The compression union is highly dependable and an economical choice of fitting within multiple applications including heating and other industrial markets. One-piece brass body provides strength, durability and longer-lasting performance. This fitting features a vibration resistant construction. It resists mechanical pullout and is designed for high pressure service. Designed for use with potable and non-potable water, instrumentation, hydraulic and pneumatic systems. One-piece brass body provides strength, durability and longer-lasting performance Drill Through (No Tube Stop), Both Ends Designed for use with aluminum, copper and plastic tubing. Plastice tubing requires NPT insert and oPT sleeve. Not intended for steel tubing Designed for use with potable and non-potable water, instrumentation, hydraulic and pneumatic systems Little to no tube preparation required. Connection does not require flaring, soldering, or other types of tube preparation Plastic and PEX tubing installations require sleeves and/or inserts. Check installation instructions for exact requirements Rough Brass May be used in both indoors and outdoors. Temperature rating: -65° to 250° F at maximum operating pressures Working pressure: 300 PSI