Add to cart RO Low Pressure Switch 1/4 inch $26.78 The RO Low Pressure Switch is typically used for protecting the booster pump from a low pressure situation such as loss of supply water. Size (mm): 55 x 45 x 35 Off Pressure: 10-14 psi On Pressure: 40 psi Max Pressure: 65 psi Connection: 1/4 inch Quick Connect Add to Wishlist