Pentair 261003 Manual Air Relief Valve - 2-3/8in, NS/FNS

What 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 top leaks.

Key Features and Specifications

• Manufacturer part number 261003
• Manual air relief valve
• 2-3/8in specification
• Compatible with NS and FNS filter models
• Supports safe air release

Installation and Fitment Guidance
Relieve filter pressure before removal. Confirm by manufacturer part number before ordering. Tighten securely without overtightening threads.

About the Pentair Brand
Pentair filters are widely installed in residential and commercial pools. Their serviceable air relief valves support safe startup and maintenance. Genuine Pentair parts maintain proper fit and sealing.

Common Service Context
Common during filter cleanings, seasonal startup, or resolving leaks at the filter top.