Accumulator Tank 0.75L Pre Pressurized for RV Water Pump Maximum 125PSI 1/2 MNPT Port Fitting with 2 Clamps 1 PTFE Tape Item Type: Mini Pressure Tank Size: Approx. 20 x 12.7 x 11.4cm / 7.9 x 5 x 4.5in Volume: 0.75L (25.3FL.OZ) Charging Pressure: 10PSI 0.7BAR Maximum Operating Pressure: 125PSI 8.6BAR Fill Valve: Standard car type tire valve Inlet Outlet Diameter: 1/2in MNPT Features: Play the role of constant pressure to prevent the system pressure from rising and falling, so that the waterflow is more gentle Function: 1. For RV Use: Effectively absorb excess heat entering the water system piping due to the heater, no poof sound when the faucet is turned on 2. For RV Water Leakage: After long term use of the RV, pipe connections may loosen, resulting in dripping water, this causes the pump to start frequently, the pressure tank can effectively reduce the frequency of water pump starts 3. During Showering: The pressure tank can effectively improve the frequent start stop of the water pump caused by uneven piping and nozzles Working Principle: 1. The pressure tank has pre charging pressure before leaving the factory 2. When the water pump is turned on, water enters the pressure tank. When the pressure tank is full, the water pump stops working 3. When water is needed, the water in the pressure tank enters the pipeline first due to the pressure, the water pump remains closed until the pressure in the pressure tank is lower than the start pressure of the water pump, the water pump starts working, repeat this cycle