About this item The pressure input is 1/4FThe water pump pressure can be adjusted through this pressure switch, and you can adjust the adaptive pressure according to of my needs. It is important to know that the pressure inlet dimension is not the same for all pumps. The pressure inlet nut of this pressure switch is 1/4F. Easy to adjustThis pressure switch has a fitting, a nut and a ring. Remove the nut and ring that will not be used. Screw the connector onto the pressure switch then screw the pressure switch onto the pump. This may not be possible if something in the pump is blocking the rotation. Get an adapter and it finally works fine. The pressure switch whose pressure inlet nut rotates freely around its axis until it is fully tightened. Automatic controlThis pump pressure switch will automatically activate the pump when the pressure is lower than the set threshold of the pressure switch. and it will automatically stop the pump when the pressure is higher than the set threshold. High Quality MaterialsThis pump pressure switch is made of high quality materials for strength and durability. Widely UsedThe water pump pressure switch is easy to install and can be used for a long time. Suitable for most water pumps, such as automatic water pumps