peter paul valve, #73
The Peter Paul valve, #73 electric over air solenoid defaults normally closed. This simply means that when no electricity is charging the valve, it closes. It defaults in the closed position; however, the #74 solenoid defaults in the normally open position. For more info on the #74 valve, select the above link. You can use the #73 valve in tandem with the #74, HW74PP9ZGM, when wiring a lift kit, to activate the up/down position of the airbags by dumping/filling them. Both the #73 and #74 use only two wires, one ground and one hot. As long as both wires are hooked up, the way they are wired does NOT matter.
When using the #73 valve, you must also use a pressure regulator to control the airflow through it. If you do not use a regulator, the valve will soon leak because of the direct pressure it functions under. For the Peter Paul valve, your pressure regulator must be preset to 100psi or lower.