A two-part clamp-connected chimney flue tee. The tee includes an elongated main section which is detachably connected to a transversely extending bull, or snout section. The main section has flue pipe connection ends and an oval cut-out portion in its sidewall, generally midway between the connection ends. The periphery of the cut-out includes an outwardly flaring flange, for mating with a corresponding contoured end of the bull section. Hooks are mounted on the inner sidewall of the main section, on opposing sides of the cut-out. Lever-actuated clamps, having a U-shaped locking member, are mounted on opposing inner portions of the sidewalls of the contoured end of the bull section. In mating the two sections, the bull section is press-fitted over the flange surrounding the cut-out. A locking member on one side of the contoured end is engaged with a respective hook. Then, the lever on the clamp is snapped toward the adjacent sidewall, into a locked position. The process is repeated for the locking member, the hook, and the lever on the other side of the conjunction, to secure the two sections firmly together.