Once connected to a POM rod, the flail head is inserted into the flexible flue liner and the other end of the rod is "snapped" onto the drill adaptor. As the flail advances, more rods are applied in the same way. The flails have a diameter of 300mm (12") and are designed to distort as the head is pushed into the flexible flue liner.
Because the connected rods use joints incorporating a flat section, the drill action can be set to forward or reverse which can be an advantage where stubborn soot or fly ash deposits are encountered. The flails are tightly clamped within the head by use of a grub screw located in the cap which, when tightened, applies a firm pressure to the assembly.
The bristle head does not require rotation and is simply pushed using the hand grip. It can be used with as many rods as are necessary to brush the entire flexible flue.