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Alpha WDP-320 5" Wet/Dry Variable Speed Polisher
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At a Glance
Quick Decision Guide
Disc Size
5"
Speed Range
700–2,500 RPM
Power
800W
Voltage
120V
Amperage
7.0A
Spindle
5/8"-11
Wet/Dry Use
Yes
Weight
7.3 lbs
Why Choose This Product
Key Benefits
Wet & Dry Operation
Supports water-fed polishing or vacuum-assisted dry applications
Variable Speed Control
Adjusts from 700 to 2,500 RPM for polishing and grinding
Ecoguard G Control
Helps contain water, dust and polishing debris
HEPA Vacuum Ready
Connects to a compatible vacuum for dry concrete polishing
Close-to-Wall Access
Removable guard cover supports polishing and grinding near edges
Heavy-Duty Gearing
Step-down transmission supports controlled, dependable operation
Extended Working Reach
Includes 15 ft. water and power connections
Inline GFCI
Factory-attached protection supports wet electric polishing applications
Product Information
Product Details
Specifications
Brand
Alpha®
Part Number
WDP-320
UPC
749173541056
Product Type
Wet/Dry Variable Speed Polisher
Model
WDP-320
Disc Size
5"
Voltage
120V
Amperage
7.0A
Power
800W
No-Load Speed
700–2,500 RPM
Speed Control
Variable
Spindle
5/8"-11
Wet Polishing
Yes
Dry Polishing
Yes
Dust Collection
Vacuum Compatible
Guard
Ecoguard G
Power Cord Length
15 ft.
Electrical Protection
Inline GFCI
Water Hose Length
15 ft.
Water Hose Type
All-Weather Flexible & Kink-Free
Handle Types
C-Handle & Reversible Side Handle
Weight
7.3 lbs (3.3 kg)
Warranty
1 Year Tool Warranty
Included Equipment
GFCI, Water Hose Assembly, Water Spray Valve Assembly, Stainless Steel Hose Band, Rubber Band, Open End Wrench, Pin Wrench, C-Handle, Reversible Side Handle, Extra Carbon Brush Set, Rubber Hose Adapter, Ventilation Cap, Ecoguard G, Flange & Lock Nut Set, EasyOn-EasyOff Sleeve
Factory Attached
GFCI, Water Hose Assembly, C-Handle, Ventilation Cap, Ecoguard G & EasyOn-EasyOff Sleeve
About This Product
5" Variable Speed Polisher for Wet and Dry Work
The Alpha® WDP-320 Wet/Dry Variable Speed Polisher is a 120V, 800W electric polisher for tile edges, concrete countertops, and concrete floors. Its 700–2,500 RPM no-load speed range provides control across polishing and grinding applications, while the 5/8"-11 spindle is optimized for compatible 5" discs.
Ecoguard G for Water and Dust Control
The factory-attached Ecoguard G helps contain water and polishing debris during wet tile edge and concrete countertop work. For dry concrete polishing, the guard connects to a compatible HEPA vacuum to support a virtually dust-free setup. Removing the Ecoguard G front cover and installing the magnetic plate allows polishing or grinding close to walls.
Heavy-Duty Gear System with Reduced Vibration
A heavy-duty gear system combines a step-down transmission with bevel and pinion gearing to produce the variable speed range. Precision-machined components reduce operating noise and vibration, while the coated spindle reduces friction at the oil seals to support longer tool life.
15-Foot Power and Water Connections
The WDP-320 includes a 15 ft. power cord with an inline GFCI and a 15 ft. all-weather, kink-resistant water hose. A 3 ft. EasyOn-EasyOff sleeve bundles the connections near the tool to reduce cord and hose interference during wet polishing.
Dual Handles and Included Polishing Accessories
A C-handle supports torque-oriented applications such as dry concrete polishing with a 5" disc, while the reversible side handle provides control during general edge polishing. Included equipment also covers the water-feed components, wrenches, extra carbon brushes, ventilation cap, flange and lock nut set, hose adapter, Ecoguard G, and related mounting hardware.
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
Can the Alpha WDP-320 be used for wet and dry polishing?
Yes. The WDP-320 supports water-fed wet polishing and vacuum-assisted dry polishing. For dry operation, Alpha instructs users to remove the water-supply assembly and connect a compatible vacuum to the Ecoguard G.
What is the speed range of the WDP-320?
The WDP-320 has a variable no-load speed range of 700 to 2,500 RPM.
What size polishing discs does the WDP-320 use?
Alpha recommends 5" discs for all WDP-320 polishing applications. Smaller 3" and 4" discs may fit, but water distribution and operating stability are optimized for 5" discs.
Can the WDP-320 polish or grind close to a wall?
Yes. Removing the Ecoguard G front cover and installing the magnetic plate allows the tool to work close to walls and other edges.
Can a HEPA vacuum be connected for dry concrete polishing?
Yes. The Ecoguard G can connect to a compatible HEPA vacuum to support a virtually dust-free dry polishing and sanding setup.
Does the WDP-320 include GFCI protection?
Yes. Its 15 ft. electrical power cord includes a factory-attached inline ground fault circuit interrupter.
What handles are included with the WDP-320?
The polisher includes a C-handle for torque-oriented applications and a reversible side handle for general edge polishing.
Can the WDP-320 be used for cutting?
No. Alpha does not recommend using the WDP-320 for cutting because its operating speed does not provide the peripheral blade speed required for cutting applications.
What equipment is included with the Alpha WDP-320?
The WDP-320 includes the factory-attached Ecoguard G, water hose assembly, water spray valve assembly, C-handle, reversible side handle, open-end and pin wrenches, extra carbon brushes, rubber hose adapter, ventilation cap, flange and lock nut set, EasyOn-EasyOff sleeve, and related hardware.
What warranty is included with the WDP-320?
Alpha provides a one-year warranty against defects in materials and workmanship from the original retail purchase date.