This is the entire housing connection that contains a pressure gauge, needle valve, return and outgoing tube connection fittings. It screws directly into your system pump.
See the 2nd picture in the product description that shows exactly what this replaces. See area circled in red.
IMPORTANT!! This product uses 3/8" return line tubing that connects to the needle valve and returns into your reservoir tank. You can see the tubing in the 2nd picture. Please let us know above if you need this tubing. We will provide it at no charge.
