4" PelletVent Pro Vertical Kit For Cathedral Ceilings 4PVP-KVB This cathedral ceiling vertical kit includes a vertical cap to provide a secure seal on a pipe storm collar to prevent debris and water from entering the chimney liner cathedral ceiling support box with trim and clamp adjustable roof flashing and appliance adaptor to connect to your appliance. Pipe lengths not included. Use with pellet oil corn and bio-fuel appliances Laser-welded super ferritic stainless steel inner walls and galvalume outer walls Outer diameter is 5/8" larger than inner diameter 1" clearance to combustibles No additional gaskets or sealants needed The precise fit of twist-lock connections is fast secure and leak resistant. Adaptability is provided by swivel elbow connections and multiple termination options Laser-welded double-wall pipe with a .012†inner wall of corrosion resistant stainless steel and a .018†laser-welded galvalume outer wall. Painted black exterior available. Primary metal-to-metal connection seals joint. Encapsulated O-ring provides a secondary seal.