These 20 pack of the 2 gang Extra Duty, UL listed in use covers are the best on the market! Not only are they much more rigid than those at the supply house or home stores, but they come with an extra heavy gasket to ensure a water tight seal. They have an easy to install insert to convert from decora to a duplex outlets. . This 20 pack will save you money and you'll love the quality and UL listing! We don't have all the parts you use, but we have all the parts you use the most at great savings! Additional Details ------------------------------ Product description: These 20 pack of the 2 gang Extra Duty, UL listed in use covers are the best on the market! Not only are they much more rigid than those at the supply house or home stores, but they come with an extra heavy gasket to ensure a water tight seal. They have an easy to install insert to convert from decora to a duplex outlets. . This 20 pack will save you money and you'll love the quality and UL listing! We don't have all the parts you use, but we have all the parts you use the most at great savings!