Pet Yard Plastic Exercise Pen Expansion Panel, 2-Piece, Gray features Two-panel extension kit Extension kit expands Superyard Classic to 34.5 square feet By adding this extension kit you can increase the Superyard classic size

Give your child even more safe space to play while keeping him in view with the Extension Kit for the Superyard XT Play Gate. The 2-panel kit attaches to the 6-panel Superyard XT to increase the play area from 18-1/2 sq. ft. to 34-1/2 sq. ft. Your little one and a sibling or friend will have a safe place to entertain themselves while you catch up on household tasks. Portable and lightweight with easy setup. Gray plastic. Made in USA. Each panel 26Hx65L”.

Q:How does the extension connect

A:

Do you have the origional pet yard? This is an extension to it. So you attach it just as you connect the pieces in the origional one…the bottom end you connect by pushing the bottom down with the piece your using to attach… And slide the top in place. The instruction book gives a better description.
Hope this helped.

Q:Do these extensions work with model number 8666?

A:

Sorry I do not know.