Pentair Rainbow HC Series Control Valve | R172439
The Pentair Rainbow R172439 is the replacement control valve used on Pentair Rainbow High Capacity (HC Series)
automatic chemical feeders/chlorinators. This valve is used to regulate the feeders output by controlling the
water flow through the unit, helping you dial in consistent sanitizer delivery once your pools baseline demand
is established.
Compatibility
- Fits: Pentair Rainbow High Capacity automatic feeders/chlorinators models HC-3315, HC-3330, HC-3340
- Use case: Replacement part where the feeder parts diagram calls for R172439 control valve
What This Part Does
- Adjusts and maintains the feeders output by managing internal water flow through the chlorinator body
- Helps prevent over-feeding or under-feeding caused by a worn, sticking, or leaking valve assembly
- Restores proper adjustment range when the existing control valve is damaged or difficult to turn/set
Common Signs It Needs Replacement
- Feeder output wont adjust normally (stuck at high/low)
- Valve is hard to turn, binds, or wont hold a setting
- Unexplained changes in sanitizer output after youve already dialed in the feeder
- Visible cracking, warping, or leak paths around the valve assembly
Installation Notes
- Shut off the pump and relieve system pressure before servicing the feeder.
- Set the feeder to minimum output prior to disassembly (helps prevent sudden dosing changes on restart).
- Inspect and clean the feeder internals while open; debris or scale buildup can affect output.
- After replacement, restart at a conservative setting and fine-tune over 2448 hours while testing water.
Related Products
- Rainbow HC Series Hose Bib / Drain Valve (R175009)
- Rainbow HC Series Flow Rate Indicator (R172082)
- Silicone Lubricant for O-rings and seals (R172036Z)
- Rainbow HC Series Lid Assembly (R172385D)
- HC-3315 feeder parts
- HC-3330 feeder parts
- HC-3340 feeder parts
Maintenance Tips
- Keep water chemistry balancedhigh calcium hardness and high pH accelerate scale buildup that can affect output control.
- Periodically inspect feeder fittings and seals for minor leaks; small leaks can cause big changes in dosing over time.
- When servicing the feeder, clean and lightly lubricate O-rings with silicone lube (never petroleum-based products).
- After any adjustment, retest free chlorine/bromine and pH the next day and fine-tune gradually.
