*O-ring sizes are tricky - Different batches of filter housings may differ slightly in their O-ring sizes. If you order an O-ring (free of charge), let us know whether it is too large or too small - We will then mail you the next larger/smaller size until it fits. Conditions: (1) Your filter system must be purchased from us and not from another vendor, (2) You will need to pay for the shipping. Note: Limit: One O-ring at a time.

Click on the following link for additional information on diverter valves and faucet thread adapters.