Ferret Centering Fitting - SnapLok Female - Large
 
This is a simple centering fitting for flue sizes from 4" up to 8". Use 2.7mm whip line so you can get two strands through each hole. It does not provide any protection for the camera like the centering brushes, but it's a very effective way to keep the camera centered.
 
Attaches to the back of the Ferret camera and allows you to connect to the large SnapLok rod fittings(12mm, 15mm rods etc).