Pentair 1/2-Inch Control Valve Replacement for Rainbow Feeders — R172086, OEM Fit & Leak-Resistant

Pentair R172086 is a 1/2-inch control valve designed to replace the valve in Pentair Rainbow automatic chlorine and bromine pool and spa feeders.

This replacement control valve restores reliable flow control for salt-free chemical feeders used in residential pools and spas. It directly fits Rainbow feeder models 320, 322 and 300-29X, offering a factory-compatible part when the original valve shows wear, leaks, or reduced performance. The valve is manufactured in Taiwan and sized at 1/2 inch to match the feeder plumbing and fittings.

How do I know this valve will fit my Rainbow feeder?

Check your feeder model number—this R172086 valve is made to match Rainbow models 320, 322 and 300-29X. Confirm the valve size is 1/2 inch and visually compare mounting points to your existing valve to ensure alignment.

• Compatible models: Rainbow 320, 322, 300-29X
• Valve inlet/outlet diameter: 1/2 inch
• Direct OEM replacement—matches original geometry and mounting
• Manufactured in Taiwan for consistent quality

What improvements can I expect after replacing the control valve?

Replacing a worn or leaking valve restores precise flow regulation and helps prevent chemical overfeed or underfeed. You’ll typically regain smooth operation, tighter seals, and reduced chance of drips at connections.

• Restores accurate feed rate control
• Reduces leaks and drip points
• Improves longevity of feeder operation
• Easy swap-in for minimal downtime

How difficult is installation, and what tools do I need?

Installation is straightforward for a person comfortable with basic pool equipment maintenance. Turn off the feeder, relieve system pressure, remove the old valve, and install the R172086 control valve using common hand tools and thread sealant where required.

• Tools: adjustable wrench, pliers, plumber's tape or thread sealant
• Time: typically under 30–45 minutes for a standard replacement
• Safety: power and feed lines should be turned off before starting
• Support: consult your feeder manual for model-specific steps

What should I inspect after fitting the replacement valve?

After installation, run the feeder through a short cycle while watching for leaks and confirming steady flow. Verify connections remain tight and that the feeder dispenses chemicals at the expected rate without unusual noise or resistance.

• Check all threaded connections for tightness and leaks
• Observe operational flow for at least one full cycle
• Confirm chemical dispensing matches prior settings
• Recheck after 24 hours of normal operation

Who this is for: The Pentair R172086 control valve is intended for pool and spa owners, service technicians, and maintenance professionals who operate Rainbow automatic chlorine/bromine feeders and need an OEM-compatible valve replacement. It’s ideal for anyone facing leaks, inconsistent chemical feed, or a failed valve on Rainbow models 320, 322 or 300-29X who prefers a direct-fit, manufacturer-grade part to restore reliable feeder performance.