Like the Vapor Pin^® Barb Extension or the Vapor Pin^® 1.5-inch Extension, the Sealing Extension is placed beneath the Vapor Pin^® to minimize contact between soil gas and the hole in the slab. The Sealing Extension has the additional advantage of using a second Vapor Pin^® sleeve at the base of the slab. Depending on slab thickness, one or more Vapor Pin^® 1.5” Extensions can be placed between the Vapor Pin^® and the Sealing Extension to extend the assembly to the bottom of the slab. Unlike most stainless steel products from Vapor Pin^®, the Sealing Extension is not designed to be removed or reused. Available in stainless steel only.