This is a replacement rigid (non-swivel) wheel for your PolarCool 36" Pro portable evaporative cooler. If one of your cooler's fixed casters has cracked, flattened out, or seized up, this part restores it — no air fill required, since it's solid rubber.
The Pro 6" Rigid Caster is a genuine PolarCool replacement component, built to carry the weight and terrain demands of a full-size portable evaporative cooler. Solid rubber construction means no flat tires and no air-pressure maintenance — a real advantage for units that get rolled across gravel lots, warehouse floors, and job sites repeatedly. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Fitment & Requirements
- 6" solid rubber wheel, rigid (fixed) caster style — not a swivel caster.
- Fits PolarCool 36" Pro evaporative air coolers only, which use a combination of 2 swivel + 2 rigid casters.
- Includes 1 rigid caster and all mounting hardware specific to the 36" Pro.
- NOT compatible with other 36" PolarCool models (non-Pro) — those require caster SKU 6450-6051.
- Verify your exact model designation before ordering; casters are not universal across the PolarCool 36" line.
Key Benefits
- Solid rubber construction — no flats, no air fill, no pressure checks.
- Rated for rough terrain: concrete, asphalt, gravel, dirt, and uneven ground.
- Direct-fit replacement hardware included for the 36" Pro chassis.
- Genuine PolarCool component, matched to OEM caster mounting points.
- Reduces recurring maintenance versus air-filled caster wheels.
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Wheel Diameter | 6 | in |
| Caster Type | Rigid (fixed) | — |
| Wheel Material | Solid rubber | — |
| Quantity Included | 1 caster + mounting hardware | ea |
| Price | 39.00 | USD |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: PolarCool 36" Pro portable evaporative air cooler (rigid caster position; unit requires 2 rigid + 2 swivel total).
- Does NOT fit: other 36" PolarCool models outside the "Pro" line — use SKU 6450-6051 for those.
- Confirm your model plate reads "36 Pro" before ordering; PolarCool does not treat casters as interchangeable across the 36" range.
Compliance & Environment Table
| Item | Detail |
|---|---|
| Wheel Material | Solid rubber (flat-free, no air/pressure hazard) |
| Intended Use Environment | Warehouse, industrial, and outdoor cooling deployments |
FAQ
Will this caster fit my PolarCool 36" Pro evaporative cooler?
Yes. This rigid caster (6422-6021) is designed specifically for the PolarCool 36" Pro, which uses two swivel casters and two rigid casters. Confirm your model is the "36 Pro" before ordering.
Is this a swivel caster or a rigid caster?
This is the rigid (fixed) caster. The 36" Pro requires two rigid casters and two swivel casters for a complete set — order the swivel version separately if you need both.
Does this fit other 36-inch PolarCool models, not just the Pro?
No. This part is built for the 36" Pro specifically. Other 36" PolarCool models use a different caster, SKU 6450-6051. Verify your exact model before ordering.
Do I need to add air to this wheel like a pneumatic tire?
No. This is a solid rubber caster, so it's flat-free by design. There's no air chamber to maintain or lose pressure over time.
What's included with this part?
You get one rigid caster wheel plus the mounting hardware specific to the 36" Pro chassis.
Warranty & Registration
This is a genuine PolarCool replacement part. For manufacturer warranty terms, registration steps, and full product documentation, refer to the "Resources (System Manuals and Warranty)" Tab above on this page. [NEEDS VERIFICATION: specific warranty duration/terms not included in supplied data.]
