Factory pre-charge: 38 psi (pounds per square inch). Maximum working pressure 100 psi. Maximum operating temperature: 200 F (degree Fahrenheit). Meets NSF (National Sanitation Foundation) Standard 61 requirements for clean, safe drinking water. 11″ x 15-3/8″, 3/4″ Male IPS (iron pipe size) pipe connection. 5 year warranty. Blue tank. No. HT-4B: Type: Jet Pump, Tank Capacity: 4.4 gal, Tank Dimensions: 11″ dia x 15-3/8″ H, Drawdown 20-40 PSI: 1.6 gal, Inlet Size: 3/4″ MIPS