| Restore reliable water feed to your whole-house humidifier with this 4040 humidifier water solenoid valve replacement, designed to replace a failing inlet valve that causes low humidity, no water flow, or inconsistent operation. It operates on 24 V and draws 2.3 W, supports up to 125 PSI, and uses a 3/32 in orifice to help deliver controlled water flow. Built with a brass body and copper wiring for corrosion resistance and dependable daily cycling, it installs with standard 1/4 in compression fittings and straightforward wiring for fast service by DIY homeowners or HVAC technicians. Compatible with Aprilaire 220, 224, 400, 400A, 400M, 440, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 600, 600A,… | |
