According to energy.gov The potential energy savings from reducing drafts in a home may range from 5% to 30% per year. Past methods include messy caulk or expensive boxes. Draft Seal is a simple, cost-effective way to achieve the same results! Simply snap Draft Seal onto any standard new work box, and attach the enclosed seal on the back. The green ring remains visible after dry wall install. Our fast, easy method complies with the IECC building code requirements for thermal performance and air leakage, reducing drafts coming in through outlets, vapors that cause mold inside walls, and sound transmission through walls.