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Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
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273550 | Pentair FNS Nautilus Plus SM & SMBW 4000 Series Filters Manual Air Relief
Fits these models (4)
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
On the Pentair Purex SMBW 4000 Series SMBW 2024 / 4024 Filter diagram
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Other parts on the same Pentair Purex SMBW 4000 Series SMBW 2024 / 4024 Filter
OEM Pentair 273550 Manual Air Relief Assembly is designed to safely vent trapped air from your pool or spa filtration system, helping prevent pressure-related issues and supporting consistent filter performance. This air relief unit includes a manual release valve and pressure gauge and is specifically compatible with Pentair FNS, Nautilus Plus, SM, and SMBW 4000 series filters. Constructed from rugged materials for durability in demanding aquatic environments, it promotes efficient system operation and contributes to filter longevity. Its straightforward installation makes it an essential component for pool techs and advanced DIYers maintaining proper system pressure and flow.
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Critical Safety Function: Relieves trapped air in filter tanks to prevent excess pressure buildup and support safe filtration operation.
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Optimizes Filter Efficiency: Ensures smooth flow and maximum media performance by maintaining internal system balance.
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Broad Filter Compatibility: Designed for use with Pentair's FNS, Nautilus Plus, SM, and SMBW 4000 series filters.
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Built for Durability: Constructed to handle chemical exposure and outdoor conditions common in pool system installations.
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Includes Gauge Assembly: Ships with both air relief valve and pressure gauge for a complete OEM replacement setup.
- (1) Manual Air Relief
- (1) Pressure Gauge
- Pentair FNS Filters
- Pentair Nautilus Plus Filters
- Pentair SM and SMBW 4000 Series Filters
