Alpha WDP-320 Wet/Dry Variable Speed Polisher
The Alpha WDP-320 Wet/Dry Variable Speed Polisher is the next evolution of the trusted WDP-120, redesigned with major performance upgrades to meet the rigorous demands of professional polishing. While maintaining a similar exterior, the WDP-320 features a heavy-duty gear system with a step-down transmission and bevel and pinion gears, delivering a variable speed range of 700 to 2,500 RPM—perfect for precise, controlled polishing in both wet and dry applications.
Engineered for durability and comfort, the WDP-320 boasts precision-machined parts that minimize noise and vibration, along with a specially coated spindle to reduce friction and extend oil seal life. The all-weather flexible, kink-free 15 ft. water hose and a 3 ft. EasyOn-EasyOff sleeve offer unmatched maneuverability. The inline GFCI power cord ensures safety on any job site.
Equipped with the Ecoguard G, the WDP-320 allows for mess-free wet polishing and efficient dry edge polishing when connected to a vacuum. For close-to-wall finishes, simply remove the Ecoguard’s front cover and attach the magnetic plate. The unit comes complete with a C-Handle for torque-intensive applications like dry concrete polishing and a Side Handle for general edge polishing—making the Alpha WDP-320 a versatile, professional-grade hybrid solution for every surface.
WDP-320 Wet/Dry Variable Speed Polisher Main Features
- Wet/Dry Hybrid Polisher with The Ecoguard G Attached for Tile Edge Polishing Without The Typical Mess
- Provides The Best Quality Polish On Concrete Countertop Surfaces When Used with Water, or A Vacuum
- Heavy-Duty Gear System Includes A Step-Down Transmission
- Variable Speed Range of 700 To 2,500 RPM
- Polish or Grind Right Up To The Wall
- 15ft. Electrical Power Cord Has An Inline GFCI
- Coated Spindle for Reduced Friction
- 15ft. Water Hose Is All-Weather Flexible and Kink-Free
- Long-Lasting Tool Life and A Comfortable Application
- Includes Side Handle for Edge Applications
- Fits 5” Discs
- Combine with HEPA Vacuum for A Virtually Dust-Free Solution
- One Year Tool Warranty*
Alpha WDP-320 Wet/Dry Variable Speed Polisher Specifications
| Feature | Value |
|---|---|
| Model | WDP-320 |
| Rating | 120 Volts |
| Amperage | 7.0A |
| Power | 800W |
| No Load Speed (Variable) | 700~2500 RPM |
| Weight | 7.3 lbs (3.3 kgs) |
| Spindle | 5/8″-11 |
Equipment Included
| Item | Quantity |
|---|---|
| Ground Fault Circuit Interrupter* | 1 |
| Water Hose Assembly* | 1 |
| Water Spray Value Assembly | 1 |
| Stainless Steel Hose Band | 1 |
| Rubber Band | 1 |
| Open End Wrench | 1 |
| Pin Wrench | 1 |
| C-Handle* | 1 |
| Side Handle (reversible) | 1 |
| Extra Carbon Brush Set | 1 |
| Rubber Hose Adapter | 1 |
| Ventilation Cap* | 1 |
| Ecoguard G* | 1 |
| Flange & Lock Nut Set | 1 |
| EasyOn-EasyOff Sleeve* | 1 |
| *Factory Attached | 1 |
WDP-320 Wet/Dry Variable Speed Polisher Related Documents
| Document Type | Link |
|---|---|
| Manual | WDP-320 Manual v0721 |
| Manual | WDP-320 v1 |
| Manual | WDP-320 v2 |
| Parts-Schematic | WDP-320-v1 Parts/Schematic |
| Flyer | WDP-320 flyer |
| Other | Warranty Information |
Additional Information
| PartNo | UPC Code | Pkg. Weight (lbs) | Package Dimensions | Commodity Code | Country Of Origin |
|---|---|---|---|---|---|
| WDP-320 | 749173541056 | 11.05 | 20in x 8.5in x 7in | 8464.20.0120 | China |
Frequently Asked Questions
Can I use the same carbon brush set I purchased for WDP-120 on WDP-320?
No. Unfortunately you need to use the designated carbon brush designed for WDP-320 since they are not the same parts.
Can I use WDP-320 for cutting application?
No. Alpha® doesn’t recommend using a polisher for cutting applications due to the lack of peripheral speed you can get using the max rpm of the polisher.
How can I use WDP-320 for dry polishing application?
You need to remove the EasyOn-EasyOff Sleeve from hoses and remove the whole water supply assembly from the polisher. You then connect to a vacuum to obtain a virtually dust-free dry sanding and polishing application.
Is the Limited Warranty the same as before (90 days)?
No. Alpha® warrants this product against defects in material and workmanship for a period of 1 year from the date of original retail purchase.
What diameter discs are used for edge polishing applications?
Alpha® recommend using a 5” diameter for all polishing applications with WDP-320. You may be able to use 3” and 4” diameter polishing discs, however, the water distribution and stability are optimized with 5” so that it is much easier to use the 5” discs.
What kind of maintenance do I have to do on WDP-320?
Alpha® recommend the daily discharge of water from the water hose and spindle. We also recommend to blow dry the inside of the motor housing to keep motor dry and blow dust out from moving parts, if compressed air is available.
Where can I send the WDP-320 for repair and maintenance?
You can purchase spare parts from Alpha® if you have a maintenance shop within your company. If you would like to get local service, please take your tool to your local Alpha® dealer or other tool repair shop who offers repair and maintenance services. You may also send it directly to Alpha® for factory repair and maintenance services.
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