About this Company

We started in 2012 as a small team designing and manufacturing a backflow prevention line that would later be called the Deringer. Today, the Deringer product line is known as the smallest, lightest, and only all stainless steel backflow prevention valve on the market – and they’re built right here in the USA.

Over the years, we’ve continued to design shorter, lighter, and better performing products that you can rely on. That’s why our backflow preventers and every other product we carry are all safety certified, so you can rest assured knowing you have a reliable, high-quality product.

  • All of our Products Have Been Fully Certified (UL, FM, ASSE, CSA, NSF, USC) in Backflow Prevention
  • Six issued U.S. Patents in Backflow Prevention
  • Three U.S. Patents Pending in Backflow Prevention


Top Rated Products

Shopper Approved collects trusted reviews from customers who have made a verified purchase.

Shopper Approved - Verified Customer
3" Deringer 20G (DC)
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Tony J - 11/11/2022

Hands down the best company to work with Period!!!

Tony J

11/11/2022 - OR

The Absolute best in Backflow Valve Sales!!!!!

Shopper Approved - Verified Customer
6" Deringer 30G (DCDA-II)
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Dewayne M - 11/07/2022

Quick shipping and good prices.

Dewayne M

11/07/2022 - WI

Great price and selection.

Shopper Approved - Verified Customer
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Jacob E - 03/13/2022

Should include longer bolts for the relief to attach to the backflow

Jacob E

03/13/2022 - TX

Quick and easy as usual

Shopper Approved - Verified Customer
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Kevin R - 12/26/2021

Slick device

Kevin R

12/26/2021 - NY

Slick Device

Shopper Approved - Verified Customer
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Jacob E - 12/21/2021

The goat of backflows

These backflow devices are the best made products on the market. I will only install these devices til someone makes another American made device.

Shopper Approved - Verified Customer
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Alex P - 12/20/2021

Good product

Alex P

12/20/2021 - CA


Air Gap with Splash Guard, C400/C500, 2 1/2
Shopper Approved - Verified Customer
Air Gap with Splash Guard, C400/C500, 2 1/2" - 10"
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James U - 12/19/2021

All good

James U

12/19/2021 - MA

Easy Ordering

Shopper Approved - Verified Customer
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Mike D - 11/29/2021

Very pleased with Deringer and the super fast delivery! I will continue to order from Deringer. Thanks!

Mike D

11/29/2021 - NM

Thank you for your help Katherine!!

Shopper Approved - Verified Customer
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Calvin C - 11/15/2021

Timely feedback and delivery

Calvin C

11/15/2021 - CA

Whether it is the delivery or the customer service, the outstanding service ensures my return.

1 1/4
1 1/4" Double Check Valve Backflow Preventer (Grooved)
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Jacob - 09/28/2021

Perfect fit

Came in quick and works like a champ.

2 1/2
2 1/2" DERINGER 20 (DC)
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Fire J - 09/02/2021

Great choice! easy to install and high quality

Very compact and high quality product in stainless steel. Easy to install. Recommend to those looking to do a good quality job and make future maintenance easy.

Company Response

Thank you for the feedback Joe! Glad it was easy to install!

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