British Made flexible chimney liner rods and brushes are an ideal solution for sweeping lined and twin-walled chimney systems. The flexible nylon rods are capable of navigating around the tightest of 45 degree and 90 degree bends in the flue with ease. Solid brass couplings fixed to each rod ensure a tight connection to each rod with smooth edges to eradicate any risk of damage to the chimney. Please note that using rigid rods systems such as drain rods on a flexible flue liner can tear the walls and are only to be used on masonry or pumice chimneys. Our flexible rods have a 1/2? Whitworth solid brass female and male end and are suitable to use with our soft, medium or hard liner sweeping brushes.