It's another first from Carlon® - the first nonmetallic junction boxes UL Listed with a NEMA 6P rating per Section 370-29, exception of the 1999 National Electrical Code. Manufactured from PVC or PPO thermoplastic molding compound and featuring gasketed lids attached with stainless steel screws, these rugged enclosures offer all the corrosion resistance and physical properties you need for direct burial applications.