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.