This AC WORKS brand transfer switch inlet box features a NEMA L14‑20P 20‑amp 125/250‑volt 4‑prong locking inlet designed for generator, emergency, and temporary‑power applications. Built from heavy‑duty thick metal, the enclosure withstands impacts, chemicals, and harsh weather conditions, making it ideal for outdoor installation.The inlet box includes a weather‑tight seal and a strain‑relief structure, along with multiple conduit knockout options: two combination ½″ / ¾″ knockouts and five replaceable knockouts with included plates providing ½″, ¾″, and 1‑½″ configurations. The top access port accepts GE and Midwest brand raintight hubs.This unit is cETLus certified and engineered for reliable, long‑term performance in emergency or backup power setups.Included with your purchase is a 5‑year limited warranty.