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Expansion & Overflow Tanks: what should you pay?

What you'll usually pay

$56.75 typical price
Most are between$15–$195
Brand new$69.95
Used$24.38
On sale now1,185

💡 Buying used saves about 65% here.

💚 Best value for your money

United States 388 on sale$22.74 · 60% cheaper
Polaris 343 on sale$23.53 · 59% cheaper
Genuine OEM 639 on sale$24.95 · 56% cheaper
Yamaha 73 on sale$24.99 · 56% cheaper
Japan 114 on sale$24.99 · 56% cheaper

Price by brand type

Genuine OEM
$24.95-56%
Aftermarket Branded
$53.99-5%
Not Specified
$59+4%
Unbranded
$65+15%

Price by brand

Polaris
$23.53-59%
Yamaha
$24.99-56%
Not Specified
$59+4%
Unbranded
$65+15%
ASI Performance
$69.95+23%
Dorman
$93.99+66%

Price by country of origin

United States
$22.74-60%
Japan
$24.99-56%
Not Specified
$59+4%
China
$69.95+23%
Taiwan
$92.99+64%

Price by performance part

No
$24.99-56%
Not Specified
$59+4%
Yes
$63.97+13%

🛒 Some on sale right now

How we got these numbers

Worked out from 200 live eBay listings (price range $15–$195, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 16, 2026.

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