【Top Quality】Thru hull exhaust skin fitting is made of stainless steel. It is hard and can work at high temperatures for a long time. 【Effective】For diesel heater exhaust use surface polishing design, can be better blended with the thru hull;enlarging the gap between pipes can provide heat insulation and prevent damage to the automotive. 【Specification】Automotive replacement exhaust pipes fit for 24mm inner diameter hose pipe,fit for Chinese Diesel Parking heaters. 【Easy installation】You will receive 1x thru hull exhaust skin fitting, 3x screws, 3x gaskets. It is very easy to install, very convenient.