Backflow

In each issue of Working Pressure, we ask 10 questions to a training coordinator or instructor of an ASSE-approved training provider. Some questions are...

Question: I have a 4” Apollo DCDA 4A that needs service. I am not familiar with this unit. What is the best way to remove...

Question: I have a 3” Watts Model 009 that needs to be serviced. I want to replace the check valve discs and relief valve rubber...

According to the ASSE International Plumbing Dictionary, working pressure is the maximum pressure in a water piping system allowable under normal working conditions. Likewise,...

There are many types of backflow protection devices and assemblies – each is designed for a specific application – but the most prominent of...

Question: I have a 4” Deringer Model 40. Can you tell me how to change the rubber parts for the checks and relief valve? Are...

The 2021 model code cycle is wrapping up and with it comes the news of what to expect. Knowing what is coming will affect...

Question: I am trying to repair an Ames 4” Model 2000SS. The check valves are very difficult to remove. Could the checks be cross threaded...

In keeping with its motto, “Prevention Rather Than Cure,” ASSE International is in the final stage of review and publication of four of its...