Brass Push>Connect Air Brake Tube Fitting, 0.50 Inch Tube OD Union

Push-to-connect is exactly what this fitting does. You cut the tube clean with a tube cutter, push it in until you feel it stop solid, then give it a tug to make sure it's seated. No tools needed for assembly, and when you need to take it apart, you just depressurize the line, press the collet head in, and pull the tube free. It's a one-piece brass union, so you're connecting two same-size half-inch OD tube ends straight through.