Add to cart RO High Pressure Switch 1/4 inch $26.78 The most common application of the RO High Pressure Switch is to cut off power to a booster pump when pressure builds up in the RO system triggered by a float valve in a holding tank when it becomes full. Size (mm): 74 x 64 x 24 Off Pressure: 40 psi On Pressure: 8-9 psi Max Pressure: 215 psi Connection: 1/4 inch Quick Connect Add to Wishlist