Welcome to Defender Canada! 
Perko Plug-In Type Base Item # 2087090
Description
Features:
- Polished Stainless Steel
- Black Polymer
- Waterproof Snap-On Cover
- Fits 3/4" Poles with Locking Collar
- Pigtail Leads
- Available in 2 Pin and 3 Pin Versions
Specifications:
- Base Diameter: 2 1/4"
- Pole Rake: 0 deg.
- Screw Size: #8