Swimables 3/4" Stainless Air Vent for FNS Plus

Key Fit and Function

• Releases Trapped Air from Filter Tank – Designed to safely vent trapped air during startup, preventing pressure buildup and ensuring proper filter operation

• Compatible with FNS Plus & Nautilus Filters – Fits Pentair FNS Plus and Nautilus-style pool filters that use a 3/4" air vent connection

• 3/4" Threaded Replacement Fit – Matches original thread sizing for straightforward replacement without plumbing modifications

• Stainless Steel Construction – Corrosion-resistant stainless steel provides longer service life than plastic vents in harsh pool environments

• Supports Proper Circulation & Priming – Removing trapped air helps maintain consistent water flow and reduces strain on pumps and filter components

• OEM-Equivalent Aftermarket Replacement – Swimables replacement engineered to match OEM fit and function at a lower cost

• Recommended Service Item – Replace if the vent leaks, corrodes, sticks, or fails to release air properly during system startup

Proper air release is critical to safe and efficient pool filter operation. The Swimables 3/4" Stainless Steel Air Vent (SW-26-855) is a corrosion-resistant replacement designed for Pentair® FNS Plus and Nautilus® style pool filters, allowing trapped air to escape during startup and normal operation.

Over time, factory air vents can corrode, seize, or leak due to constant exposure to pool chemicals and pressure changes. When an air vent fails, filters may trap air, causing pressure spikes, poor circulation, or unsafe operating conditions. This stainless steel air vent restores reliable air relief while offering improved durability over standard plastic components.

Built for long-term performance, the SW-26-855 is an ideal service replacement for residential and commercial pool systems using FNS Plus or Nautilus-style filters.

Reliable Air Release for Filter Safety

This 3/4" air vent allows trapped air to exit the filter tank, preventing air binding and maintaining stable system pressure. Proper air venting protects internal filter components and helps ensure consistent water flow through the filtration system.

Stainless Steel Construction for Long-Term Durability

Unlike plastic air vents that can crack or degrade, this stainless steel design offers superior resistance to corrosion, chemical exposure, and pressure-related wear—making it well suited for both chlorine and saltwater pool environments.

FNS Plus & Nautilus Style Compatibility

The Swimables SW-26-855 is manufactured to fit Pentair FNS Plus and Nautilus-style pool filters, providing a direct replacement with proper thread sizing and sealing performance.

Why a Functional Air Vent Matters

• Prevents trapped air inside the filter tank

• Helps maintain safe operating pressure

• Protects internal filter components

• Improves circulation efficiency

• Reduces startup and priming issues

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the Swimables 3/4" Stainless Steel Air Vent (SW-26-855) from Benchmark Pool Supply, you’re getting a dependable replacement part backed by experienced pool professionals. We stock high-quality components designed to keep pool filtration systems operating safely and efficiently.