The Hubbell HBL4550 Twist-Lock Duplex Receptacle Outlet is a vintage 3‑wire grounded duplex receptacle rated at 15A, built to accept twist-lock plugs. It provides two outlets in a single device, delivering a secure, locking electrical connection when paired with compatible twist-lock components. This Hubbell part carries the HBL4550 model designation, making it a straightforward replacement for installations that originally used this style of twist-lock, grounded receptacle.
