Product parameters: 1/4 inch fitting. Voltage: 24 volts. Inlet pressure: 15 - 50 psi. This iSpring PMP5 booster pump can be mounted in several positions, such as Reverse Osmosis systems, etc. to increase the water pressure. Compatibility: The pump works with 75 GPD and 100 GPD Reverse Osmosis systems. Please note: Transformer is not included. If you need a transformer, please search iSpring ATRF5. If you want to add the booster pump to the RO system, you may also need other accessories to automatically turn on / off the system, such as the Low- & High-Pressure Switch, Feed Water Solenoid Valve, Auto Flush Solenoid Valve, and a Transformer.