DuraVent Type B Gas Vent Standard Connection Tee Cover - For Connection Tees with a 4" Diameter - 4GVTC: This unit necessitates a venting pipe with a 4" inner diameter. This vent connection tee cover is for a type B gas vent standard connection. This vent comes in four different sizes. The type B system is for venting hot water heaters, boilers, gas fueled fireplaces, furnaces, and other Category 1 appliances. UL listed to UL 441 and UL1777 ULC listed to ULC S605. This product made by Dura Vent Type B will integrate with other compatible Dura Vent Type B components without any special adapters.

Covers a 4" Dura-Vent Type B Gas Vent Standard Tee 25-year warranty