Valve Check 1 1/2-2" 2# Corrosion Resistant
Product Overview
Technician-grade backflow protection designed to withstand concentrated chlorine and bromine streams.
The Pentair R172288 (part 172288, also referenced as RAI-451-4039) is a corrosion-resistant 1-1/2 inch to 2 inch in-line check valve engineered specifically for high-stress sanitizing systems. It prevents concentrated chemical backflow into sensitive pool heaters and pumps on Pentair Model 320 and 322 In-Line feeders, as well as HC-3315, HC-3330, and HC-3340 high-capacity units.
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Benefits & What Makes It Different
Chemical-Resistant Design
Constructed with specialized corrosion-resistant components to resist aggressive chlorine gas and acidic degradation over standard check valves.
Universal 1-1/2" or 2" Fit
Engineered to plumb directly into 1-1/2 inch PVC pipe internally or 2 inch fittings externally for versatile equipment pad installation.
Essential Heater Protection
Stops concentrated chemical backflow from corroding expensive copper heat exchangers when the filtration pump cycles off.
Compatibility
- Pentair Rainbow Model 320 & 322 In-Line Chemical Feeders
- Pentair High Capacity Automatic Chemical Feeders HC-3315, HC-3330, HC-3340
- 1-1/2 Inch and 2 Inch PVC plumbing systems
When To Use This
Pro Tip
Always verify the molded flow direction arrow before gluing; installing backwards completely blocks return flow and risks immediate equipment over-pressurization.
Common Questions & Instructions
Which chlorinator models are compatible with the Pentair R172288 check valve?
The Pentair R172288 (also known as 172288 / RAI-451-4039) fits Pentair Rainbow Model 320 and Model 322 In-Line automatic chemical feeders, plus commercial HC-3315, HC-3330, and HC-3340 high capacity series.
What symptoms indicate my chemical feeder check valve has failed?
Common failure signs include chemical smells near the equipment pad, discolored water backing up into the heater, or visible pitting on copper heat exchanger coils caused by back-siphoning.
Can a homeowner install the Pentair 172288 check valve DIY?
Yes, installation is DIY-friendly if you have basic PVC cutting and gluing skills. Always ensure the flow direction arrow points toward the pool and away from heaters or pumps.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
