★★★★★ 5
Perfect fit
Great quality filters, both fit snug
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
Pentair Manual Air Relief Assembly for FNS, Nautilus Plus, SM & SMBW 4000 Filters — Part 273550
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Pentair Manual Air Relief Assembly for FNS, Nautilus Plus, SM & SMBW 4000 Filters — Part 273550The genuine Pentair 273550 Manual Air Relief Assembly is purpose built to safely release trapped air from your pool or spa filter tank, protecting against excessive pressure buildup and promoting steady filtration output. This assembly incorporates a manual air release valve along with a pressure gauge and is specifically compatible with Pentair FNS, Nautilus Plus, SM, and SMBW 4000 series filters. Manufactured from tough, chemical resistant materials
Quick Dispatch:
Your Pentair Manual Air Relief Assembly for FNS, Nautilus Plus, SM & SMBW 4000 Filters — Part 273550 orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your Pentair Manual Air Relief Assembly for FNS, Nautilus Plus, SM & SMBW 4000 Filters — Part 273550 ships.
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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]
- Please click here for more details>>> Return & Exchange Policy
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4.1 ★★★★★
Based on 230 reviews
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Product Reviews
★★★★★ 5
Great price
2018 Honda Civic EXL Turbo great fit, great price!
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Reviewed in the United States on March 15, 2026
★★★★★ 4
Good fit.
Good fit.
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Reviewed in the United States on October 29, 2025
★★★★★ 5
Great product!
I have a 2022 CRV and these filters are great quality, they fit perfectly and are better than the factory brand with a much better price.
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Reviewed in the United States on January 4, 2026
★★★★★ 5
Price and quality.
Perfect! Saves you money over dealership! Simple to install! Quick and easy!
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Reviewed in the United States on January 18, 2026
