Another Case of Why Brand new Backflow Preventions Assemblies need to be inspected upon InstallationThis is the reason brand new backflow preventers need to be inspected.
If you see this in the field, please don’t test it. This is a serious problem that will cause problems for everybody that touches it. So, advise the client that this needs to be corrected.
Don’t Do It. Don’t open up any watts LF009 or variety of models of the 009 that are being used for Hot Water with out a complete Check Valve on hand.