Seal the Deal with the Perfect O Ring for Your 3-Inch Hub Adaptor
This replacement O ring is designed specifically for the 3" hub adaptor (part #300/500288) and fits a 3 3/4" hole size. Perfect for maintaining a secure, leak-free seal on your tank fittings, it's an essential part for reliable RV plumbing performance.---
Replacement O Ring ONLY - use with #300 (500288) 3" Hub Adaptor
Part # 300 O Ring
| Inner diameter (inches) | 3.75 |
|---|---|
| Compatible hub adaptor size (inches) | 3 |
| Product type | O Ring |
| Hole size (inches) | 3.75 |
| Part number | 300-O'RING |
| Compatible part number | 300 |
| Material | Plastic |
| Category | Fitting |
- What is the o ring compatible with? The O Ring is a replacement part designed to be used with the #300 (500288) 3" Hub Adaptor.
- What is the hole size of this o ring? The O Ring has a hole size of 3 3/4 inches.
- Is this product sold as a replacement o ring only? Yes, this product is the O Ring only and does not include the hub adaptor.
- What is the part number for this o ring? The part number for this O Ring is 300 O Ring.
- Who is the vendor or manufacturer of this o ring? The vendor for this O Ring is CPI.
Need Fittings Installed on This Tank?
Use our free Custom RV Tank Builder — visually place fittings, get an instant price, and order with professional installation included.
100% Authentic OEM Parts
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.