Pentair Manual Air Relief Valve, 2-3/8", for NS/FNS Filter | 261003 Rectangular Fire & Water Bowl Rola Chem 527158 Brass Injection

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Pentair Manual Air Relief Valve, 2-3/8", for NS/FNS Filter | 261003 Rectangular Fire & Water Bowl Rola Chem 527158 Brass InjectionWhat This Part Is Used For Pentair 261003 Manual Air Relief Valve 2 3 8in, NS FNS is a replacement air relief valve for compatible Pentair Nautilus and FNS filter models. It allows manual release of trapped air from the filter tank. Why This Part Matters Trapped air can cause pressure fluctuations and inefficient filtration. A functioning air relief valve restores proper priming and pressure balance. Replacing a leaking or stuck valve prevents filter