Reverse Osmosis 100 GPD Diaphragm Booster Pump (240 volt)DC 24 V Transformer + 2 Pcs Connect Fittings (1/4 inch tube x 3/8 inch Threaded )+ High Pressure Shut Off Switch + 1/4 inch Tube OD quick fit Solenoid Valve This pressure gauge should be installed in between the third and forth stage before or after the auto shut off valve in your reverse osmosis system. You have to measure the PSI in your system when the pre-filters are new (usually it should be reading between 55 to 65 PSI). Any pressure drops (normally that will start after couple of months when the filters start clogging with dirt) then the pressure gauge will start reading between 45 to 50 PSI) therefore this is a visible indication for you to change the filters. High pressure switch for reverse osmosis booster pump ( on - off) operation control. High pressure switch job is to turn off the booster pump when the tank is full.The pump will automatically control all residential reverse osmosis systems. The pump turns on to produce water into the pressure tank, and then turns off when the pressure tank is full. This pump is able to work at least 3 months continuously without stopping. Features This booster pump is designed for membranes rated 100 GPD.It can be mounted in several positionsSafe power operation with, low energy (low voltage - 24 volt). Transformer included.The motor of these boosters is Duty cycle will vary with load and ambient temperature smoother running longer life and work with high efficienciesnever Mind if its installed in warm, humid, hostile environment where other pumps can’t operate in such hard environments.Product total weight with transformer 6 Lbs - Booster dimensions 6.5 inch X 4 inch X 4 inchTransformer Approved. 100 GPD High + Low Switches 50-75 GPD + Pressure Gauge 150GPD + Gauge, Solenoid Valve, High Pressure Switch, Adapter Buying Options Add to Cart Buying Options Customer Reviews — 3.9 out of 5 stars 57 4.0 out of 5 stars 1 Price — no data $116.95$116.95 — no data Gallons per Day 100 GPD 50 - 75 GPD 150 GPD High Pressure Switch ✓ ✓ ✓ Pressure Gauge no data ✓ ✓ Bracket ✓ no data Aquarium no data no data Fittings& Transformer ✓ ✓ no data