Andrew Sheppard Plumbing Services


What is a backflow prevention assembly?

A backflow prevention assembly is a means or mechanism to prevent backflow.


Thebasic means for preventing backflow is an air gap.  If you have a dishwasher in your kitchen, you have a backflow device right at the sink, that funny gizmo with the slots in it.


The basic mechanism for preventing backflow is a mechanical backflow preventer, which provides a physical  barrier to backflow.  The principal types of backflow preventers are the reduced pressure principle assembly, the pressure vacuum breaker assembly and the double check valve assembly.

If you see water coming from these slots, call me!

What is backflow ?

(The following, as interpreted by my wife, from the Manual of Cross-connection Control 9th edition and the WWW)

Backflow refers to the reverse flow of non-potable water  or other substances, through a cross-connection and into the piping of a public or a customer's potable water system.

Why do backflow prevention assemblies need to be tested?

Mechanical backflow prevention assemblies have internal seals, springs, and moving parts that are subject to wear and fatigue.  Also, mechanical backflow preventers and air gaps can be bypassed.  Therefore, all backflow prevention assemblies have to be tested periodically to be sure that they are functioning correctly.  

Mechanical backflow prevention assemblies have to be tested with properly calibrated gauge equipment.

"My water company just sent me a notice that I have to have my backflow device tested. 

What's the next step for me?"


Give me a call or go to my contact page and email or fax me a copy of your backflow test form.  

We will schedule a test time that is convienient for you.

You don't have to handle any of the paperwork, we handle all that for you!

We email, fax or mail (depending on the requirements of your water company)   the test results  the day the test is performed, and we will email, fax or mail a copy of the test to you for your records.

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