Our Masonry Adapter is for installations that pass through a masonry wall to connect double wall stove pipe to an existing masonry chimney. It's constructed with a 26 gauge steel outer wall and a corrosion resistant, 400 stainless steel inner liner. The double wall construction allows a 1/4" air space between the inner and outer pipes to provide superior insulating value to accommodate higher flue gas temperatures, while creating an outer shell that remains cool to the touch. Our Masonry Adapter is coated with a scratch resistant, black enamel finish and is only compatible with DSP double wall black stove pipe. Benefits of double wall construction Increased efficiency Less creosote build up Reduced smoking of the stove at start up Less chance of moisture or soot built up within the vent