Backflow Preventer Pricing
Analysis of 3,856 eBay listings for backflow preventers.
What you'll usually pay
💡 Used ones cost about 48% more here.
👉 In short easy summary
The best value is found in 1/4 in models, which are 57% below the market median. Larger 1 in units are closest to the median price, with only a 15% delta.
💚 Best value for your money
Price by pipe size
Why? Prices scale with size, ranging from 59.89 for 1/4 in to 119.49 for 1 in units.
Price by brand
Why? Brand recognition impacts cost, with Unbranded units at 65.5 and Not Specified at 123.59.
🛒 Some on sale right now
Common questions
What is the median price for a new backflow preventer?
The median price for new units is 114.49.
How do used backflow preventers compare in price?
Used units have a higher median price of 169.5 compared to the overall market median of 140.
Which pipe size is the most affordable?
The 1/4 in pipe size is the most affordable with a median price of 59.89.
How we got these numbers
Worked out from 200 live eBay listings (price range $24–$462, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 2, 2026.