★★★★★ 5
Make sure you know the size
Yes worked like a charm
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
CMP 25831-110-100 Backwash Valve Piston Kit - Replacement for Pentair FNS Plus Filter | 263055 | SW-26-055
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
CMP 25831-110-100 Backwash Valve Piston Kit - Replacement for Pentair FNS Plus Filter | 263055 | SW-26-055Get your Pentair slide valve back in working order with the CMP Backwash Valve Piston Kit 25831 110 100. This aftermarket kit serves as a direct substitute for the Pentair 263055 piston shaft assembly and is commonly paired with FNS Plus DE filters. It contains the complete piston shaft assembly needed to restore proper backwash function, ensuring water flows correctly through your filtration system during cleaning cycles. Key Benefits Drop In
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Your CMP 25831-110-100 Backwash Valve Piston Kit - Replacement for Pentair FNS Plus Filter | 263055 | SW-26-055 orders ship within 1-2 business days.
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- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.9 ★★★★★
Based on 1259 reviews
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Product Reviews
★★★★★ 5
Great fitment, made changing the oil filter easy
Perfect fit for my m760i oil filter housing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
★★★★★ 5
s tier quality
superior quality, single cast aluminum 👍
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Reviewed in the United States on May 2, 2026
★★★★★ 4
Too Tight but It Works
It doesn't really sit on very well to be honest, it tends to sit TOO tight in my opinion. Taking it off can be a hassle but at least it gets the job done, durability is good, finish is great, obviously easy to use.
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Reviewed in the United States on April 28, 2025
★★★★★ 5
BMW F25
Saved me when tried to change the oil. Great price
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Reviewed in the United States on May 23, 2026
