https://www.mccoys.com/shop/p/6313076-052303-36/amerivent-6hs-ta-chimney-tee-assembly
Chimney tee, tee branch (made up of one 12 in section of chimney), single wall adaptor, pipe end plate and tee cap. Use this combination where connection to chimney is made in branch of tee in through-the-wall installation.
Dimensions
6 x 16 x 3
Includes
Chimney Tee, Pipe End Plate, Single Wall Adapter, Tee Branch and Tee Cap