Again, this kit is designed for use with 4 inch inner diameter DuraFlex pipe, but it's also intended to work with a DuraVent DuraFlex Zero Clearance insulation sleeve to meet the UL 1777 standard for masonry chimneys and wood burning appliances. The kit helps ensure safe and efficient venting of your heating appliance, plus it protects your masonry chimney from the damaging effects of flue product condensation.
With your purchase you'll receive a rain cap, a collar plate, and a mortar sleeve. This combination provides a means of finishing the venting installation safely, conveniently, and with maximum weather-resistance. When you weigh the benefits of this kit against the cost, it's easy to see why so many homeowners and chimney professionals rely on a DuraFlex SS Gas Component Kit in their venting installations.