Pentair Rainbow Drain & Vent Valve (Black) / Air Relief Plug | R172224X
The Pentair Rainbow R172224X is a black drain and vent valve (also commonly called an air relief plug) used on select Pentair/Rainbow cartridge filters and chemical feeders. It provides a convenient point to vent air and/or drain water during service, helping with filter maintenance, winterization, and safe pressure relief when used as designed for the equipment.
Key Features
- Drain & vent valve / air relief plug used for servicing and draining compatible filters and feeders.
- Helps with maintenance by allowing controlled air bleed and water drainage (as applicable to the unit).
- Direct replacement for a cracked, leaking, or missing drain/vent plug.
- Black valve body commonly shown on Pentair/Rainbow parts diagrams for Dynamic and HC equipment.
Compatibility
- Pentair/Rainbow Dynamic Series cartridge filters: Series I (RDC), Series II & III (RTL/RCF)
- Pentair/Rainbow High Capacity chemical feeders: HC-3315, HC-3330, HC-3340
- Sta-Rite Predator II mini-cellular media filters (where specified)
- Also fits other assemblies that specifically call for R172224X on the parts list
Specifications
- Brand: Pentair / Rainbow
- Part Number: R172224X
- Color: Black
- Part Type: Drain & vent valve / air relief plug
- Approx. Dimensions: 0.94″ L x 0.85″ W x 0.85″ D
- Common Alternate/Cross References: 4690-02, 172224X, R172224XZ (packaging/revision varies by supplier)
Important Note on Seals
- Some applications use an O-ring/seal for this valve. If your valve is dripping after replacement or the old O-ring is flattened,replace the matching O-ring/seal specified on your equipment’s diagram.
Common Reasons to Replace
- Water seeping or dripping at the drain/vent point
- Cracked valve body from age, chemical exposure, or freeze damage
- Valve no longer vents/drains properly due to wear or damaged sealing surfaces
- Missing plug/valve after service
Installation Notes
- Shut off the pump and relieve pressure before servicing any filter or feeder component.
- Remove the old valve and clean the sealing surface/threads on the housing.
- Install the replacement valve snugly—avoid over-tightening, which can damage plastic housings.
- Restart the system and inspect for leaks under normal operating pressure.
Related Products
- Search Aqua Pool Supply for R172224X
- Pentair Rainbow HC-3315 parts
- Pentair Rainbow HC-3330 parts
- Pentair Rainbow HC-3340 parts
- Pentair/Rainbow Dynamic RDC filter parts
- Pentair/Rainbow Dynamic RTL/RCF filter parts
Maintenance Tips
- Open/close drain and vent components gently—forcing them can crack housings and strip threads.
- When winterizing, fully drain equipment to reduce freeze damage risk to valves and filter bodies.
- If you see persistent seepage, inspect the sealing surface and replace the correct O-ring/seal specified for your model.
