GenTran 30 Amp 125/250-Volt Non-Metallic Generator Power Inlet Box NEMA L14-30 30 Amp non-metallic power inlet box; UL listed for generators up to 7500 watts Durable, glass-filled nylon NEMA 3r-rated enclosure includes 30a 120/240v male inlet in NEMA configuration l14-30 on bottom High-impact, UV stabilized, glass-filled nylon resin; 99-inches of wiring room and 6 knockouts provide ultimate wiring flexibility Since generator connection is made on the bottom, these power inlet boxes retain the "rain tight" rating while in use A sloped top and posts on the back allow precipitation to drain off