39 PCS PACKAGE: The DOT air brake fittings kit includes: 4 pcs 1/4" tee fittings, 4 pcs 3/8" tee fittings, 2 pcs 1/2" tee fittings, 6 pcs 1/4“ straight union, 4 pcs 3/8“ straight union, 2 pcs 1/2“ straight union, 4 pcs 1/4" 90°elbows, 2 pcs 3/8" 90°elbows, 2 pcs 1/2" 90°elbows, 6 pcs Y splitters, 1 pc tube cutter. Air brake fitting assortment types: 1/4", 3/8", 1/2" | PREMIUM QUALITY: Our DOT air hose fittings are made of high-quality CA360 brass and high-strength plastic, meet D.O.T. FMVSS 571.106 approved, SAE J1131 air brake system requirements, with corrosion resistance, high-temperature ductility, low permeability and long service life | MAX WORKING INTENSITY: The brass fittings can be operated in pressures from vacuum to 250 PSI and in temperatures from -30°F to +180°F (-34°C to +82°C). Note: see the tubing manufacturer's recommendations for pressure and temperature mutations | EASY INSTALLATION: The DOT quick connect design makes the installation of air brake accessories easy, just push to connect | WIDE APPLICATION: The DOT air brake fittings can be used with air suspension systems, copper tubing in airline brake systems, perfect for truck /RV repair air line leak, also ideal for industrial workshops, daily garden or lawn mower repair, towing machine hose connection, etc