Answer
Dec 15, 2025 - 07:11 AM
For the 1/4 in. NPT Threaded - Tee - 300# Black Malleable Iron Pipe Fitting - UL Listed, the maximum operating pressure is 2000 PSIG at temperatures from -20° F to 150° F. As temperature rises, the rated PSI decreases. For detailed ratings at various temperatures, please refer to the complete Malleable Iron Pressure Temperature Chart.
