This 24Vac solenoid valve is designed to use with Hayward Stratum vacuum release system models VR1000, VR1000NT. The solenoid valve is replaced by disconnecting the two wires marked "solenoid" from the board. Disconnect the tubes from the solenoid valve, by pushing the fitting ring in toward the valve while gently pulling on the tubing. Removing the two screws at the base of the valve will allow the solenoid valve to be removed from the box. To reinstall the solenoid valve the fittings must be removed and replaced in the correct order. Replace TFE tape as needed. Per the labeling on the solenoid valve, the 5/16-inch tube fitting is installed in Port "A". The 1/4-inch tube fitting is installed in Port "P". The metric (Gray ring) fitting is installed in Port "R". The short black 5/16-inch tubing is installed between the bulkhead and the solenoid valve. The small black tubing is a metric tubing and is installed between the board and Port "R" on the solenoid valve. The clear tubing is installed between the "Vent" fitting bulkhead and Port "P" of the solenoid valve. Install the two screws that were removed to hold the solenoid valve in place. Replace the wires in "solenoid" position on the board. Weighs 12.6-pound.