Pentair 261186 Top-Mount Clamp-Style Multiport Valve (1½″ Ports)

The Pentair 261186 is a top-mount, six-position multiport valve designed to replace older valve assemblies in 1½″ plumbing sand filters. It features a clamp-style mounting collar and O-ring seal for simplified installation and reliable performance under residential pool conditions.

Key Features

• Top-mount valve design with included clamp collar and O-ring for securing to filter tank housing.
• 1½″ female pipe thread (FPT) ports compatible with standard residential sand filter plumbing.
• Six-position handle allows for functions such as Filter, Backwash, Rinse, Waste, Recirculate, and Closed.
• Built to be a drop-in replacement for older assemblies on compatible filter models, reducing the need to replace the entire filter manifold.

Technical Specifications

• Part Number: 261186
• Mounting Style: Top-mount (valve body sits above filter tank lid plane)
• Port Size: 1½″ FPT (female pipe thread)
• Mounting Method: Clamp-style collar with O-ring seal
• Positions: Six standard functions including Backwash and Filter

Installation & Compatibility Notes

Before installation, ensure your filter tank is compatible with a top-mount valve and uses 1½″ plumbing. Shut off the pump and relieve all pressure from the system. Remove the old valve, clean the filter tank closure surface and install the new valve using the supplied O-ring and clamp collar. Confirm proper alignment of the handle and verify all plumbing connections are secure. After startup, rotate the handle through each position to purge air and verify correct flow direction for each function.

Maintenance Tips

• Keep the O-ring lubricated with a suitable pool-safe silicone grease to maintain a proper seal.
• Inspect handle mechanism and port gasket annually for wear or cracking and replace if needed.
• During backwash cycles check for leaks around the clamp collar or valve base; retighten if necessary.
• If the system shows loss of flow or unexpected pressure rise, inspect the valve for internal blockages or worn diverter components.

Why Choose This Valve?

The Pentair 261186 provides a reliable, service-friendly solution when replacing worn or outdated multiport valve assemblies in compatible 1½″ sand filtration systems. Its clamp-style design and included O-ring simplify installation, allowing you to update the valve without replacing the entire filter tank lid or manifold. For pool professionals and service technicians, this offers an efficient and cost-effective way to restore filter functionality.