Feature:1. Dimensions: The outer diameter of the fitting hole is 24mm/0.94in, the inner diameter is 20mm/0.79in, fit for hose, tube or pipe.2. High Strength Stainless Steel: Thru hull exhaust skin is made of marine grade 316 stainless steel, rustproof, chemical resistant, can deal with harsh environment.3. Mirror Polished: The surface of the thru hull exhaust fitting has been polished, rust resistance and durability in the saltwater environment.4. Application: Suitable for Yacht, ship pipe exhaust vent, diesel heater exhaust, fit for Webasto, for Planar, for Eberspacher, Chinese Diesel Parking heaters var4.5. Easy Installation: Comes with screws and big gasket, thru hull exhaust pipe socket is simple to use, no complicated operations, will not take you long time.Specification:Item Type: Thru Hull Exhaust SkinMaterial: 316 Stainless Steel, Mirror PolishedDimension: The outer diameter of the hole is 24mm/0.94in, the inner diameter is 20 mm/0.79in, with black gasketApplication: Yacht, ship pipe exhaust vent, diesel heater exhaust, fit for Webasto, for Planar, for Eberspacher, Chinese Diesel Parking heaters var4.Package List:1 xThru Hull Exhaust Skin3 x Gasket3 x Screw3 x NutNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.