Pieces Tunnel Ext White 300,400,500 Series
Tunnel extension for Staywell 300, 400 and 500 series cat flaps
Adds an extra 1-7/8 inches for flush installation in thicker walls and doors
Easy to install for quick setup in most walls
2 extensions required (second sold separately) for installation in exterior walls with sheathing and siding
Connect several together for even thicker applications
