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OEM Pentair Manual Air Relief 273550 is an essential filter component used to release trapped air in pressurized pool and spa filtration systems. This assembly is compatible with Pentair FNS, Nautilus Plus, SM, and SMBW 4000 series filters and includes both the manual relief valve and a pressure gauge for full system monitoring. Built from corrosion-resistant materials, it delivers reliable operation even under chemical exposure and variable pressure conditions. Its integration into the filter tank supports consistent flow, protects internal components, and ensures long-term filter efficiency.
Highlights
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Pressure Relief Mechanism: Prevents over-pressurization by venting air buildup in filter tanks, protecting your system and maintaining safety.
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Supports Smooth Operation: Helps maintain optimal internal pressure levels to improve filtration consistency and reduce strain on equipment.
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Compatible with Key Series: Works with Pentair’s FNS, Nautilus Plus, SM, and SMBW 4000 filters to restore factory-standard operation.
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Installation-Ready Assembly: Includes manual air relief valve and matching pressure gauge for straightforward installation.
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Durability Under Load: Engineered for frequent use in pool environments where pressure cycling and chemical exposure are routine.
Includes
- (1) Manual Air Relief
- (1) Pressure Gauge
Compatibility
- Pentair FNS Filters
- Pentair Nautilus Plus Filters
- Pentair SM and SMBW 4000 Series Filters
Additional Info
Looking to replace your air relief on a Pentair filter? This section addresses local price checks, nearby availability, and proper install of the 273550 relief valve on FNS, SM, and Nautilus systems.
Checking Local Stock and Filter Fit
Explains how to confirm availability and match the right part to your filter using nearby shops.
Where can I find the Pentair 273550 air relief in stock near me?
How can I check the local price for the 273550 manual relief valve?
Will the 273550 fit my Nautilus Plus or SMBW 4000 filter from a local shop?
Installing the Valve from Local Suppliers
Covers correct fitment and installation when sourcing the part from neighborhood stores.
How do I install the 273550 relief valve on my FNS filter from local inventory?
Should I apply thread sealant when installing a shop-bought 273550?
Can a local shop help me verify the 273550 is seated correctly?
Using and Maintaining the Part
Provides care instructions for the part and how to monitor performance after install.
How often should I release air using my local-shop 273550 valve?
What causes the gauge on the 273550 to read incorrectly after install?
Can I replace just the gauge on the 273550 if bought from a nearby store?
Diagram

Questions & Answers
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