Description For Pellet And Corn Appliances. Kit Contains: 4" Horizontal Cap, 4" 90-Degree Elbow, 4" Wall Bracket, (5) 4" One-Foot Pipe Lengths, 4" Tee With Cleanout, 4" Wall Thimble, 4" Tee Support, 3" To 4" Pellet Increaser, 4" Pipe Connector, And 3" Pipe Con.