The utility model discloses a tee pipe fitting, lead to with the side including direct, side expert and direct mutually perpendicular and fixed connection are at through and through middle part, one end and direct intercommunication are led to to the side, the other end is the water inlet, through and through both ends are the delivery port, it is provided with the convex block of sidewise expert to lead directly to on just to the logical inner wall that inclines, it is half circle?ring that the block dissects the cutting plane that obtains along the plane that the logical axial lead of direct axial lead and side belonged to, the block is including being located location portion all around and being located the inboard and having elastic deformation portion, location portion and through and through inner wall butt and fixed connection, deformation portion and location portion are connected. The beneficial effect of the utility model: through -flow when direct from the side when liquid, the deformation portion of block receives producing after the impact of liquid caves in. When liquid flow in the three -way pipe finishes or other reasons lead to deformation portion to receive liquid impact force reduced, deformation portion can realize automatic re -setting to the liquid that will be located the sunk area is discharged, avoids liquid to remain.