Why won't my duravent 6 in black pipe fit into the 6 in wall

DuraVent Stainless Steel/Silver Pellet Vent Section at

DuraVent DuraPlus 6 in. x 24 in. Triple-Wall Chimney Stove Pipe

DuraVent 6- Inch Diameter Durablack Single Wall Black Stove Pipe

FanFlex: Lightweight flexible crests and patches that fold easy. - FanTex: An all-new super comfortable soft fabric. - FanFit: The authentic on-ice

M&G DuraVent 8DBK-48SS 8 Inner Diameter - DuraBlack Stove Pipe - Single Wall - 48, Stainless Steel

DURAVENT DURABLACK- 6 Stovetop Adapter #6DBK-AD

Chimney Connection/Modified Wall Thimble

SuperVent 11-Piece Chimney Pipe Accessory Kit for Wall Support in

ALLFUEL HST AllFuel 6 in. x 6 in. Single Wall 45-Degree Elbow

DuraVent DuraBlack Up to the Ceiling or Out to the Wall Venting

Duravent 6 Durablack Single Wall Stovepipe

DuraVent DuraPlus 24x6 inch Galvanized Steel Triple Wall Stove

DuraVent DVL Stove Pipe - How to Install DVL Double Wall Stove

US Stove from Tractor Supply : r/woodstoving