Used to adjust desired height of rigid liner stove pipe. Our rigid telescoping sections eliminate time consuming cutting and crimping and easily adjust for a prefect fit. Slide the telescoping section inside the rigid pipe and you will be able to extend pipe length between 2" to 22". Great to have for your installation. Manufactured with high quality 304L stainless steel. Note: Will not fit inside tee snout. Only to fit inside rigid liner. Powder Coating Available, please call for quote - Read More About Powder Coating.