Sight tubes & backflow assembly testers.

Here in Washington Backflow Assembly Testers are required to use a sight tube when testing the DCVA backflow assembly. The arrow in the photo shows the sight tube I use on vertical DCVA backflow installations inside homes. With this system I can easily catch all the water released while testing the backflow prevention assembly in a small container.

Backflow prevention assemblies are sometimes installed inside the home over hardwood floors or carpet. Having full control over the water while testing or repairing is critical in these circumstances.