The DuraVent DuraLiner 6" Oval Extend-A-Cap Kit is a premium chimney liner termination kit designed to provide safe, efficient venting for wood-burning stoves, fireplace inserts, and high-heat heating appliances. As part of the advanced DuraLiner chimney liner system, this oval extend-a-cap kit helps protect masonry chimneys from damaging flue gases while creating a secure, weather-resistant termination at the top of the chimney. It is an ideal solution for masonry chimney relining projects requiring a durable and professional chimney cap assembly.

Built to complement DuraVent’s factory-insulated DuraLiner venting system, the 6-inch Oval Extend-A-Cap Kit supports zero/zero clearance installations without the need for additional spacers or field-installed insulation. Its smooth venting path helps reduce creosote buildup, promoting improved airflow and easier maintenance. Designed to reduce installation labor by 50% or more, DuraLiner delivers dependable, code-compliant performance for demanding wood-burning applications. Approved for use in both the USA and Canada, this chimney termination kit provides lasting protection, reliable draft performance, and long-term durability.