The new 2-Gang Draft Seal™ Kit is a simple, cost-effective way to achieve better results. According to energy.gov "The potential energy savings from reducing drafts in a home may range from 5% to 30% per year.” Past methods included messy caulk or expensive boxes. With this product, simply snap it into any standard new work box and attach the enclosed seal on the back. The green ring remains visible after the drywall installation. This fast and easy method complies with the IECC building code requirements for thermal performance and air leakage. It conveniently reduces drafts coming in through outlets and vapors that cause mold inside the walls and blocks sound transmission as well.