Your check valve is essential to keep water flowing in the right direction through your unit. Depending on your model, the valve is located either on the side near the hose connections, or on top under a plastic cover.
Replacement Steps
1. Turn the cold water supply off to your system (or remove the Prefilter).
2. Remove the six (6) screws that hold the Auto Shut-off Cover onto the plastic manifold. These may be hidden under a plastic cover, depending on your model.
3. On the underside of the shut-off cover, locate the two ports with O-rings in them. The leftmost port is houses your check valve.
4. Carefully remove the current O-ring and check valve with a small tweezers or similar tool.
5. Install the new check valve into the port, with the red ring facing out towards you. Confirm it is pushed securely into the housing, and then place the new O-ring on top.
6. Flip the shut-off cover over and reattach it with the six (6) screws around the outside.
7. Replace the main plastic cover (if applicable depending on your model).
8. Open your cold supply valve under the sink or connect the Prefilter to allow water flow back through the unit.