Directions/Specifications
Get a 3/16th drill bit to drill a hole into the PVC pipe. Then unscrew the drill bit and tighten the air valve into the drill chuck. Screw the air valve slowly into the PVC hole, being careful not to over tighten.
Use a clean cut piece of airline tubing when attaching to the air valve. Periodically check for hardened aquarium airline tubing that may create a loose connection.
For ultimate flow control in a fish room, we use the Ziss Plastic Air Valve near the aquariums for fine tuning, eliminating the need to get up on a ladder when using these metal valves in a fish room air manifold loop.