DuraVent DuraVent 7" Inner Diameter - Type B Round Gas Vent Pipe - Double Wall - 3" to 7" Increaser Tee

Increaser Tee 7 Inch x 3 InchSimpson DuraVent's Type B Gas Vent system. Use with natural gas or liquid propane category I and drafthood equipped appliances, and appliances tested and listed to use Type B Gas Vent. Applications include: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications.Type B Gas Vent has been engineered to heat up rapidly. It remains hot during the operation of the appliance with minimal condensation on the appliance and vent syste...