This is a 3D printed EZ Dock Adapter for coupler nut. 
These also float unlike the brand that EZ Dock makes.
Printed in PETG Light Grey, makes it easy to locate in the water.

DRIVE TOOL 15/16″ SOCKET ADAPTOR - EZ DOCK.

The EZ Dock Drive Tool is used to tighten or loosen the composite nut used with the EZ Dock Coupler Sets. 
Fits a 15/16″ standard socket (not included)

Feel free to ask any questions.