Note: A foot valve (not included), installed on the suction inlet, is recommended to insure that the pump will keep it prime. 5. Lay out the intake and discharge pipes with as few turns as possible to prevent air pockets within the lines. Air pockets interfere with pressure switch performance. 6. Intake and discharge pipes must have a minimum of 1” to 1-1/4” diameter. Systems with larger vertical components should have larger diameter piping. Keep in mind that the maximum vertical lift (total ve