1L Constant Pressure Tank 1/2 MNPT Port Pre Pressurized Accumulator Tank for Boat Travel Trailer Maximum 125PSI Item Type: Accumulator Tank Size: Approx. 30 x 14.4cm / 11.8 x 5.7in Internal Volume: 1L (33.8FL.OZ) Inflation Pressure: 10PSI/0.7BAR Maximum Operating Pressure: 125PSI/8.6BAR Air Fill Valve: Standard Car Tire Valve Inlet Outlet Diameter: 1/2 Inch MNPT Product Use: Play the role of constant pressure, prevent the system pressure from rising and falling, so that the water flow is more gentle. Function: 1. In RV Use: It can effectively absorb the excess hot gas entering the water system pipeline due to the heater, and there will be no pop sound when the faucet is opened 2. When the RV Leaks: After the long term use of the RV, the pipeline connection may be loose, and the drip water leakage may occur, resulting in frequent start up of the pump. At this time, the pressure tank can effectively reduce the number of startup of the pump 3. During the Bath: The water pump starts and stops frequently because of the uneven pipe and nozzle, and the pressure tank can effectively improve this situation Working Principle: 1. The pressure tank has pre charged pressure before leaving the factory. 2. When the water pump is turned on, water enters the pressure tank. When the pressure tank is filled, the water pump stops working. 3. When water is needed, the water in the pressure tank first enters the pipeline due to the action of air bladder pressure. The water pump remains off until the pressure in the pressure tank is lower than the starting pressure of the pump, and the cycle repeats.