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Inogen One® G4® Cannula Barb
$18.00
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Genuine cannula barb for Inogen One G4 outlet port
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Ensures a secure, leak-resistant connection to your nasal cannula
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Sits above the output filter (RP-410) for easy monthly swaps
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Tool-assisted removal recommended (use RP-404 output filter tool)
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DIY replacement in minutes—no service visit required
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G4-specific; not for G3/G5/Rove 6
In stock
Inogen One® G4® Cannula Barb (RP-405)
The Inogen One G4 Cannula Barb (RP-405) is the small outlet nozzle that connects your nasal cannula to the device. A fresh, well-fitting barb helps maintain a tight, reliable seal, reducing the risk of leaks and ensuring your oxygen reaches you—not the room. Because the output filter (RP-410) sits directly beneath the barb, you’ll remove and reseat the barb whenever you change that filter. Keeping a spare on hand makes monthly maintenance fast and frustration-free.
This is a genuine G4 part, designed to install smoothly and hold the cannula firmly without tools or pliers.
What’s in the Box
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1 × Inogen One G4 Cannula Barb (RP-405)
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Quick install tip card
Note: Output filters (RP-410) and the Output Filter Tool (RP-404) are sold separately.
Specifications (at a glance)
| Feature | Detail |
|---|---|
| Model / Part | RP-405 (Cannula Barb) |
| Device Compatibility | Inogen One G4 portable oxygen concentrator |
| Function | Outlet nozzle that secures the nasal cannula and seals the output filter channel |
| Location | Device oxygen outlet port (above the RP-410 output filter) |
| Installation | Press-fit; hand-tight only (no pliers) |
| Tooling | Use RP-404 tool to remove barb safely during filter changes |
| Care | Wipe exterior with mild soap/water; air-dry (do not soak in harsh chemicals) |
| Replace When | Cracked, loose, discolored, or if a secure seal can’t be achieved |
| Condition | New, non-sterile accessory |
Replacement & Care Guidance
| Situation | Action | When |
|---|---|---|
| Monthly output filter change (RP-410) | Remove & reseat the barb using RP-404 | Monthly with each RP-410 swap |
| Barb appears worn, loose, or cracked | Replace the barb (RP-405) | Immediately |
| Persistent hiss/leak at outlet | Check barb fit and replace if needed; confirm RP-410 is fully seated | As needed |
| Cleaning | Wipe with mild soap/water; do not use solvents or boil | As needed |
Installation (quick steps)
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Power off the G4.
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Use the RP-404 tool to gently lift and remove the RP-405 barb (avoid twisting with pliers).
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If changing the output filter, remove the old RP-410, insert a new RP-410, fully seated.
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Press the RP-405 barb straight in until snug. Hand-tight only.
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Power on; attach your cannula and listen for normal flow (no hissing).
Tip: If the cannula slips easily, replace the barb. A tight, clean barb reduces leaks.
Compatibility
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Compatible: Inogen One G4
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Not compatible: G3, G5, Rove 6 (use model-specific barbs)
FAQs
1) Do I really need the RP-404 tool?
It’s highly recommended. The tool prevents scratching or deforming the outlet area and makes barb removal quick and safe.
2) How often should I replace the barb?
Only as needed—when it’s cracked, loose, discolored, or won’t hold a secure seal. Inspect it monthly during your RP-410 filter change.
3) Will a new barb fix oxygen leaks at the outlet?
Often yes. Leaks usually come from a worn barb, a loose RP-410 filter, or an ill-fitting cannula. Check all three.
4) Can I clean and reuse the barb indefinitely?
You can wipe it clean and reuse while it stays firm and intact. Replace at the first sign of wear.
5) Is this the same barb used on G5 or Rove 6?
No—this listing is G4-specific. Order the barb that matches your exact model.
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