The Shieldmaster 135 Degree Tee Piece is utilized when the flue passes through any external wall at 45°, and it takes the run back upto vertical.
This part allows for very easy draining & sweeping of the external system. It’s important to note that this component will need a Tee Cap. You won’t require any additional sealants or silicone to seal all the joints. It has a unique push-fit locking system to make connection and disconnection very simple. The quoted diameter is the internal diameter and the surrounding insulation makes it 2” larger.