Wilkins Zurn 950XL Backflow Preventer Dripping: Flushing vs. Rebuild

A Wilkins Zurn 950XL backflow preventer drips rapidly. User seeks a solution.

First Attempt: Flush Test Ports

"Your backflow preventer is probably dirty (fouled) internally. It doesn't take much to make them leak." Matt suggests opening the test ports (small valves on the side) one at a time, then all, then in pairs while the system runs. "This isn't the 'official' service... but sometimes it works. By doing so, the internal valves open all the way and may flush the debris out."

If Flushing Fails: Professional Rebuild

"If this doesn't cure the problem the backflow needs to be opened and cleaned. You may want professional service for this. It has a few very strong springs inside and can be a bit dangerous and difficult to reinstall. The springs are under the 2 large caps which screw off."

Backflow preventers are safety devices; improper reassembly can compromise protection. Many jurisdictions require certified testers for repairs.