YOU WILL GET THOSE: 3PCS 3/8" OD to1/4" Side NPT DOT air fittings tee union, 3/8" Brass air brake fittings WITHSTAND RANGE: 3/8" Tube OD to 1/4" NPT quick connect air fittings, brass dot push-to-connect tee union fittings working pressure 250 PSI, working temperature range -65° - 200°F | -54°C - 94°C MATERIALS USED: High quality CA360 brass is used in the copper parts, meet D.O.T. FMVSS 571.106, SAE J1131. Internal seals are made of high quality nitrile rubber rings, the maximum pressure is up to 35 kg EASY INSTALLATION: 3/8" Brass Air line quick connect fittings are easy to install. No crimping tools, adhesives or clamps are required. To complete the connection, please push the hose into the fittings hole ROTATABLE: 1/4" NPT to 3/8" Push to connect tee union with male pipe swivel make it easy to quickly connect items, saving time and money QUALITY ASSURANCE: D.O.T Air Line fittings can be used repeatedly after clogging, high pressure resistance and stability. Ordinary after the ordinary joint trip, the clamping force of the spring is very weak, the pressure resistance is poor, and it can not be reused APPLICABLE SCENARIOS: Suitable for auto parts repair, electronic manufacturing, trucks trailers or industrial. (Tip: Connectors that do not apply to water pipes) AFTER SALE: If there is a quality question, please feel free to contact us, I will do my best to solve your problem as soon as possible, until you are satisfied. All dot brass air line fittings are tested before leaving the factory 3 PCS 3/8" OD * 1/4" NPT Tee dot air fittings