For vent pipes, it creates a 45 degree offset. The top hole is 4 " wide, the bottom opening is 4 " wide, and the wye entrance is 3" wide. Connects two appliances to a single vent in a convenient manner. For use with DuraVent Type B gas vent pipes that are 4" in diameter. For alignment, the branch swivels. A 25-year warranty is included. This unit necessitates a venting pipe with a 4" inner diameter. Gas fireplaces, furnaces, boilers, water heaters, and wall or space heaters all employ a Type B vent.

Creates 45 degree offset for vent piping Features a 4 in. top opening a 4 in. bottom opening and a 3 in. wye opening Conveniently connects two appliances to a single vent For use with 4" Dura-Vent Type B Gas Vent pipes Branch swivels for alignment 25-year warranty