National

This Oval to Round adapter is to attach a 5" oval to a 6" round. The ovalized end is designed to accept ovalized inside diameter (ID) liners, while the round bottom end is crimped for easy fitting...

Crafted for seamless integration with a 5.75" x 9.5" rectangular liner, the bottom plate features an 18" x 18" base made from 18-gauge 304 stainless steel and a 1-inch high collar constructed from...

National Chimney offers a unique insert adapter that enables both front-to-back and side-to-side adjustments within the firebox. Its two-piece design allows for easy sliding to adjust the...

Designed for perfect integration with a 5.75" x 9.5" rectangle liner, the rectangle bottom plate features a 13" x 18" base constructed from 18-gauge 304 stainless steel and a 1-inch high collar made...

Engineered for seamless integration with a 5.75" x 9.5" rectangle liner, the rectangle bottom plate has a 13" x 13" base made from 18-gauge 304 stainless steel and a 1-inch high collar crafted from...

Crafted for easy integration with a 13" diameter round liner, our Square Bottom Plate is made with a sturdy 18-gauge 304 stainless steel 18" x 18" base plate and a 24-gauge steel collar standing 1...

Designed to connect with an 11" x 11" square liner, our Square Bottom Plate features an 18-gauge 304 stainless steel 13" x 18" base plate and a 1-inch high collar crafted from 24-gauge steel. It...

Designed to connect to a 10" x 10" square liner, our Square Bottom Plate features a sturdy 18-gauge 304 stainless steel base plate measuring 18" x 18" and a 1-inch high collar crafted from 24-gauge...

Crafted to connect seamlessly with a 10" x 10" square liner, our Square Bottom Plate includes a sturdy 18-gauge 304 stainless steel 13" x 18" base plate and a 1-inch high collar made from 24-gauge...

Designed to seamlessly connect with a square 10" x 10" liner, the Square Bottom Plate, featuring a sturdy 18-gauge 304 Stainless Steel 13" x 13" base plate and a 1-inch high collar crafted from...

This adapter changes a 7" oval to an 8" round connection, tailored for ovalized liners with inside diameter (ID). It includes a crimped round end for straightforward installation and is crafted from...

Converts a 7" oval to an 8" round connection. Designed for ovalized liners with inside diameter (ID), featuring a crimped round end for easy installation. Crafted from robust 304 stainless steel.

This adapter changes a 6" oval to an 8" round connection. The oval end is made to fit ovalized inside diameter (ID) liners, and the crimped round end ensures easy installation. Constructed from 316...

This adapter transitions a 6" oval to an 8" round connection. The oval end is designed to fit ovalized Inside diameter (ID) liners, while the crimped round end allows for easy installation. Built...

This adapter transitions a 5" oval to a 7" round connection. The oval end fits ovalized inside diameter (ID) liners, and the crimped round end allows for easy installation. Made from durable 316...

This rigid adapter converts a 5" oval to a 7" round connection. The oval end is designed to accommodate ovalized inside diameter (ID) liners, while the crimped round end ensures easy fitting...

Use to maintain a weather tight resistant seal between the pipe and the flashing. Seal inner edge with hi-temp silicone sealant.Additional B-Vent Info:DuraVent's Type B Gas Vent system features the...