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Oil-Water Separator Pricing
Analysis of 6,624 oil-water separator listings to determine current market value.
What you'll usually pay
$33.81 typical price
Most are between$10–$161
Brand new$33.81
Used$44.47
On sale now6,624
💡 Used ones cost about 32% more here.
👉 In short easy summary
The market median is 33.81. Value is highest in units with 2 in port diameters, while the lowest prices are found in 3/4 in models with a -38% delta.
💚 Best value for your money
3/4 in 76 on sale$21.03 · 38% cheaper
1 in 61 on sale$23.2 · 31% cheaper
1/4 in 279 on sale$23.8 · 30% cheaper
2 in 114 on sale$28.58 · 15% cheaper
1/2 in 270 on sale$29.31 · 13% cheaper
Price by port diameter
Why? Prices vary by size, ranging from a median of 21.03 for 3/4 in to 29.31 for 1/2 in.
🛒 Some on sale right now
Common questions
What is the median price for a new oil-water separator?
The median price for new units is 33.81.
Do used oil-water separators cost more than new ones?
Yes, the used median is 44.47 compared to the new median of 33.81.
Which port diameter is the most affordable?
The 3/4 in port diameter is the most affordable with a median of 21.03.
How we got these numbers
Worked out from 200 live eBay listings (price range $10–$161, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 2, 2026.