Order now and save on the DuraVent W2-WBT12 Double Wall Wide Mouth Boot Tee with the pros at PlumbersStock. This boot tee features a patented built-in mechanical locking band and triple lipped directional gaskets for ease of installation. It is used to transition from horizontal to vertical with improved flue gas flow with angled gradual transitions. The boot tee can also be used as a manifold connection to gang boilers into a common vent. M&G DuraVent products will last you a long time, but parts will wear, and you can find replacements here when they do.