Estimated Delivery: 5–9 Business Days from Order Date
Free Standard Shipping on All Orders to all 50 U.S. states
30 Day Return Policy with 15% restocking fee applies to change-of-mind returns. See full policy
You can typically expect your items to arrive within 5-9 business days, depending on your location and product availability.
Effective Date: February 7, 2026
1. Overview (Quick Reference)
2. Scope and Intent
This Return and Refund Policy applies to all purchases made through the Centra Supply website located at centrasupply.com ("Website") and shipped to customers within the United States (all 50 states).
3. Contact Information
For questions about returns and refunds, please contact our Customer Service team:
4. Return Eligibility
Customers may return products within 30 days of receipt, subject to the conditions below. We accept returns for both defective and non-defective products.
4.1 Conditions for Return
5. Return Process
5.1 Initiating a Return
5.2 Preparing Your Return
5.3 Shipping the Return
6. Return Shipping Costs and Fees
7. Specific Return and Refund Conditions
7.1 Returns Due to Change of Mind (Non-Defective Products)
Items must be unused, unassembled, and in original packaging, and the return must be requested within 30 days of receipt. A refund will be issued to the original payment method, minus the 15% change-of-mind restocking fee. Return shipping is the customer's responsibility.
7.2 Defective or Damaged Goods
Contact us within 5 business days of delivery for items that arrive damaged, or within 30 days for defects discovered later. Provide photos or videos of the defect or damage. We will offer a replacement or a full refund. No restocking fee applies, and we cover return shipping costs.
7.3 Incorrect Product Received
Inform us immediately upon receipt. We will arrange for the incorrect item to be returned at our expense and ensure you receive the correct product at no additional cost.
7.4 Product Never Arrived
Contact us if your product does not arrive within the estimated delivery time of 5–9 business days from the date of purchase. We will investigate with the carrier. If the product is confirmed lost, we will issue a full refund or send a replacement.
7.5 Order Cancellation
Before Shipment: You can cancel your order for a full refund if the cancellation request is received within 24 hours of order placement and before the order has shipped. After Shipment: If the order has already shipped, please follow the return process once received. The 15% restocking fee applies to change-of-mind cancellations after shipment.
8. Refunds
8.1 Refund Conditions
Refunds are issued after we receive and inspect the returned item. We will notify you via email regarding the approval or rejection of your refund. Items must meet the return eligibility criteria in Section 4.
8.2 Refund Processing
Once we receive and inspect the returned item, we will notify you of approval or rejection within 7 business days. It may take additional time to appear in your account, depending on your bank or card issuer.
8.3 Partial Refunds
Partial refunds may be granted for items not in original condition, damaged, or missing parts for reasons not due to our error, or for items returned more than 30 days after delivery.
9. Exchanges
We replace items that are defective, damaged, or incorrect. To request an exchange, contact us at support@centrasupply.com.
10. Non-Returnable Items
11. Warranty
As an authorized dealer, Centra Supply sells products that are covered by the applicable manufacturer's warranty. Warranty eligibility and terms are set by the manufacturer and vary by brand. If your product qualifies, contact us and we will help connect you with the appropriate manufacturer support channel.
12. Timelines
13. Legal Rights
This Return and Refund Policy does not affect any statutory rights you may have under applicable law.
14. Questions and Support
Centra Supply
Phone: +1 (630) 634-7281
Email: support@centrasupply.com
Address: 339 E Parkview Ave, Elmhurst, IL 60126, United States
Business Hours: Monday to Friday, 9:00 AM to 5:00 PM CST
Legal Business Name: AMG Digital Retail LLC
By making a purchase on our Website, you agree to this Return and Refund Policy.
The Onyx JX 21" Burnisher is a propane-powered machine built for maximum speed, safety, and efficiency. Capable of polishing up to 35,000 square feet per hour, it is ideal for maintaining vinyl tile, terrazzo, and polished concrete floors. A patented floating shroud ensures superior dust control, creating a cleaner and safer work environment.
Driven by a 708cc 19hp LPG engine featuring a patented variable jet fuel system, this burnisher reduces emissions by up to 53% compared to similar models in its class. With its durable frame, quiet operation, and versatile design, it’s a reliable choice for airports, schools, grocery stores, and retail spaces.
Onyx 21" JX Burnisher w/ 708cc Engine
Floating Dust Containment Shroud
21" Pad Driver
20lb Steel Fuel Tank with Overfill Protection Device
High-Performance Engine
708cc 19hp EPA-certified LPG engine ensures powerful and efficient operation.
Exceptional Productivity
Burnishes up to 35,000 sq. ft. per hour, increasing efficiency in large spaces.
Effective Dust Control
Patented floating shroud with 2.5" vacuum port minimizes airborne particles.
Low-Noise Operation
Operates under 87 dBA with anti-vibration isolators to enhance operator comfort.
Versatile Pad Support
3-in-1 configuration designed for 21" pads with adjustable speeds from 1,200–2,100 RPM.
Eco-Friendly Design
Reduces emissions by 53% compared to other propane engines, supporting near-zero emission standards.
Heavy-Duty Construction
Powder-coated reinforced steel frame ensures lasting durability.
Extended Runtime
Runs for up to 6 hours on a single 20lb LPG cylinder, minimizing downtime.
| Product Function | Floor Burnishing |
| Operation Mode | Walk-Behind Pad Assist |
| Power | LX700 20hp Propane Engine |
| Performance | 34,000 SqFt per hour |
| Working Width | 21" |
| Run Time | 6 Hours Per 20lb Propane Cylinder |
| Pad / Brush Size | 21" |
| Weight | 290 lbs |
| Pad Speed | 1200-2100 RPM |
| Dimensions | 21"W x 53"L x 48"H |
| Clutch | Optional |
| Emission Monitoring System | Optional |
| SAM Safe Air Monitor | Optional |
| Headlight | Optional |
| Muffler Heat Shield | Optional |
Product specification and additional features. Â
Full operation, maintenance, and safety guide.
Complete parts list and ordering information.
Complete electrical wiring diagram for troubleshooting.
Learn how to diagnose and repair an engine that does not start.
Learn how to diagnose and repair an engine that starts, but quickly dies when the key is in the RUN position.
All Onyx products purchased through Centra Supply carry Onyx’s standard manufacturer warranty. Onyx units carry a 3/3/3/3 warranty — 3 years on parts, labor, motor, and the rotationally-molded body. Coverage varies by product line — contact us for the exact terms on this model.
To Claim: Email support@centrasupply.com with your order number, product model, and a description of the issue. Photos or video of the defect may be requested. Most claims are acknowledged the same business day.
Centra Supply is an authorized Onyx dealer — your warranty is fully valid and manufacturer-backed.