Features: 10.9in: Our hull exhaust skin fits are suitable for all heater systems with 0.9in the inside diameter of exhaust system. 0.9in outer diameter is suitable for hoses with 0.9in inner diameter. 2Fitment: Our hull exhaust fittings are replacement for Webasto ,replacement for Plan ar , replacement for Eberspacher and replacement for var4 derv parking heater 3Function: Our curve thru hull exhaust skin can increase the space between pipes, which can play a role in thermal insulation and prevent damage to the hull and vehicle. 4Stainless Steel: Thru hull exhaust skins are made of 316 stainless steel, which has better rust and wear resistance in humid air or high temperature weather. 5Replacement: Our hull exhaust fittings can replace old worn parts. After use, if they feel broken, they can be replaced with another one. This cycle is very convenient. Package included: 1 x Hull Exhaust Fittings 3 x&nbspBolts 3 x&nbspNuts 2 x Rubber Gaskets 1 x&nbspStainless Steel Gasket