1/2" NPT (measures 7/8" diameter on thread). 3 Way Tee fitting. Hot and cold, up to 1000 PSI three sided T male pipe fittings are used in automation pneumatics, vacuum, and general fluid transfer. Check out our wide selection of male npt tee threaded fittings. An economical and durable solution to your piping and plumbing needs. In addition three way tee mpt fittings are also widely used in industrial manufacturing applications for lubrication, cutting fluid, coolant and oil delivery where impact and corrosion resistance is desired. Additional usage for other types of fluid transfer and handling non potable water, air and fuel.