Product details:

The DuraVent W2-WT6 wall thimble is a reliable fitting for your vent system. It belongs to the FasNSeal, a collection of special gas vent and gas vent connectors. This wall thimble has an inner diameter of 6 inches with a length of 18 inches. It is made of the AL29-4C, a special type of stainless steel that is extremely resistant to corrosion and cracking, assuring you of its durability over the years. This is for through-the-wall termination and it fits between standard wall studs. It also accommodates wall thickness of 5 to 11 inches.