【High Quality Precision Brass】LONG SERVICE LIFE - 1/2" Tube OD x 1/2" NPT Thread straight DOT approved fittings are made of high quality solid CA360 brass with red sealent coated, durability and corrosion resistance. Withstands pressures up to 250psi, and wide temperature range from -40℉ to 160℉(-53℃ to 121℃) 【Quick Push to Connect】PTC (Push-to-Connect) design for quick and easy connection and disassembly to air lines, just insert the tube directly into the air tube bottom for connection, and press the button then Pull out the tube for disassembly 【DOT Approved】Meets D.O.T. FMVSS 571.106 approved, SAE J1131 air brake system requirements. For no air leakage, when installing our air suspension kit, please ensure that the cross section of the air line is smooth and flat, no gap, uneven, and the tube cannot be oval 【360° Free Rotation】The connecting part can be rotated 360 degrees, allows you easier to install and use. Even after installation, just rotate the tee joint body to adjust the direction 【Wide Application】Boeray DOT push to connect fittings are suitable for automotive, pneumatic and air brake systems such as air bag spring suspension line repair kits, and also can be used for brake air lines and other conventional 1/2" nylon air lines Boeray 1/2" Quick Push to Connect Fittings Brass Union Straight Joint DOT Approved 1/2" Tube OD x 1/2" NPT Thread Air Line Adapter Air Suspension Kit for Truck Trailers and Air Brake System 4pcs