Model CSV125 is a CYCLE STOP VALVE recommended for 2HP and smaller pumps. It has 1 1/4" female threads and is rated for 1 to 30 gpm. The psi is preset (choose below) and is not adjustable. It is a molded thermoplastic valve. This model has an attached red coupling designed to allow the valve to be hung in the well casing (on the top joint of pipe or under the pitless adapter). It is rated for up to a total weight of 500 lbs. It can also be installed above ground as well but can vent water (leave a wet spot under it) over time so we do not recommend installation inside a home. This model can be submersed under the water.