I have a crack in one part of my sprinkler backflow preventer/vacuum breaker. It looks a lot like this:
Can I re-seal this crack? Or do I have to buy a whole new assembly?
Plumbing – repair this crack in the sprinkler backflow preventer
plumbingsprinkler-systemwaterwinterizing
Related Topic
- How to complete these repairs to the sprinkler system
- Plumbing – Problem With Sprinkler Backflow Device
- Why did the febco backflow preventer fail
- Plumbing – Irrigation backflow preventer spigot location question.
- How would you winterize this sprinkler system
- Is the irrigation system winterized properly
- Plumbing – Changing swing check valve for a Double Check Valve Backflow Preventer
Best Answer
It's a fairly standard quarter turn ball valve, for permanent repair, take the union loose, remove the valve and replace with like.
No patch you can apply will properly seal against expansion propagating through the patch material or breaking the patch material off eventually. Any moisture underneath the patch allowed to freeze will spall it off of the casting. Water pressure under the material tends to work it off akin to how the pressure in a blister separates the skin layers.
About the only thing I would recommend for patching is MarineTex which is a super duty industrial Marine Epoxy made for use on water containing castings in damp environments. You will have to sand the area to remove casting skin, extending the area beside and well beyond the crack, clean the surface thoroughly with MEK or Acetone and then mix up and apply the MarineTex per directions.