Pentair Relief Ns/Fns Manual 2 3/8In | 261003
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The Pentair 261003 Manual Relief Valve allows pool owners and technicians to release trapped air from the filter tank. Removing excess air helps maintain proper pressure and improves filtration efficiency.
This valve is commonly used with Pentair NS and FNS filter systems.
Pentair 261003 Manual Relief Valve Compatibility
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Pentair FNS D.E. Filters
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Pentair FNS Plus D.E. Filters
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Compatible with pool filters using 2-3/8" air relief assemblies
Frequently asked questions
What size filter do I need?
Filter area is matched to pump flow rate, not to pool volume alone. An oversized filter runs longer between cleanings and puts less back pressure on the pump, which is why installers routinely size up rather than to the minimum.
What is the part number for this filter?
Pentair lists this filter under part number 261003. Quote 261003 when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
How do I know when to clean the filter?
Note the pressure on a clean filter, then clean when the gauge climbs roughly 8 to 10 PSI above that baseline. Cleaning on a fixed calendar instead of the gauge either wastes effort or lets flow drop far enough to strain the pump.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
Does this listing include the internal filter elements?
Check the specification section above. Filter tanks are sold both complete and as bodies without cartridges, grids or laterals, and those internals are a significant part of the replacement cost.
Is there a warranty on this filter?
It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.