Pentair Rainbow 1/2″ MPT 90 Tube Fitting w/ Compression Nut | R172272
The Pentair Rainbow R172272 is a 90-degree elbow tube fitting with an integrated compression nut, used on select
Pentair Rainbow automatic chlorine/bromine feeders. This fitting threads into the feeder body (1/2″ male pipe thread)
and provides a secure, right-angle connection to the feeder tubing line. Its commonly replaced when the original fitting
is cracked, leaking at the threads, or no longer seals tightly on the tubing.
Key Features
- 90 elbow fitting for clean routing of feeder tubing in tight equipment pads.
- 1/2″ MPT (NPT) threaded connection to the feeder body or related plumbing port.
- Compression nut included to clamp and seal the feeder tubing.
- Helps stop leaks caused by cracked fittings, stripped threads, or worn compression surfaces.
Compatibility
- Pentair Rainbow feeders: Model 300-29X (offline), Model 320 (inline), Model 322 (inline)
- Also used on certain Rainbow feeder accessories/assemblies that specify R172272 in the parts list
Specifications
- Brand: Pentair / Rainbow
- Part Number: R172272
- Type: 90 tube fitting (elbow) with compression nut
- Thread: 1/2″ MPT (NPT)
- Tubing Connection: Compression-style (for feeder tubing)
- Quantity: Sold individually
Common Reasons to Replace
- Water dripping at the feeder tubing connection or around the compression nut
- Cracked elbow body from age, chemical exposure, or winter freeze damage
- Stripped/compromised threads causing seepage at the feeder port
- Brittle tubing that no longer seals properly (often replaced at the same time)
Installation Notes
- Shut off the pump and relieve pressure before servicing the feeder or tubing lines.
- Confirm the elbow orientation before final tightening so the tubing routes without kinks.
- Cut tubing cleanly and square, then fully seat it before tightening the compression nut.
- Use a thread sealant suitable for plastic threads and avoid over-tightening.
- After restart, inspect for slow seepage at both the threaded connection and compression nut.
Related Products
- Rainbow Compression Nut Only (R172274)
- Rainbow 300-29X Hardware / Parts Bag (R172275)
- Rainbow Inline Check Valve, 1/2″ Tube x Tube (R172324)
- Rainbow Feeder Lid O-Ring (R172009)
- Rainbow 300-29X parts
- Rainbow 320 parts
- Rainbow 322 parts
Maintenance Tips
- Inspect feeder tubing seasonally; replace tubing that is brittle, discolored, or cracked to prevent leaks.
- Keep water chemistry balancedextreme pH and high calcium can accelerate scaling and component wear.
- If you service the feeder, re-check all tubing fittings after the next few run cycles for slow seepage.
