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The 4040 solenoid valve is a 24 volt AC, electrically-operated valve that turns the water on and off to your humidifier. Preinstalled inside of the valve is a strainer screen, which filters the water before it passes through the valve, catching things like sand and dirt which could otherwise cause blockage.This humidifier solenoid valve features orifice threaded compression ends on both sides.Specifications:VOLTS: 24/60WATTS: 2.3MOPD: 125ORIFICE: 3/32-Includes compression nut, washer and inline strainer.-The inlet includes the compression fitting & ferrule.-Inlet and outlet ports are reversible. It fits and works exactly like the original part-Both the inlet and outlet are threaded 7/16 -24 UNS for accepting a compression fitting for ¼ tubing.REPLACES: B2015-S85 | B2017-S85 220, 224, 400, 400A, 400M, 440, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 600, 600A, 600M, 700, 700A, 700M, 760 and 768.INSTALLATION TIPS1)Following along with an online repair video is the easiest way to ensure proper DIY installation of a solenoid valve2)Take photos as needed to ensure proper reassembly before proceeding with replacement5)The tools required include a screwdriver and wrench if your Range is not listed above, ask us in Customer questions & answers section or visiting the AMI PARTS storefront. The information below is per-pack only 4040 BLUE HUMIDIFIER WATER VALVE: this solenoid valve includes compression nut, washer and inline strainer.it controls water flow to the humidifier to ensure proper humidity is delivered creating a more comfortable living environment MATERIAL:the solenoid is made of solid brass material, sturdy, well-tested by the manufacturer.Non original aftermarket part. Fits OEM Standards! It fixed the issue with the old valve not shutting off and allowing water to run continuously EASY TO INSTALL:this humidifier solenoid valve is easy to install,You only need a screwdriver and wrench to perform repairs FITS MODELS:Compatible with Aprilaire humidifier. Replaces 220, 224, 400M, 440, 500, 500A, 400, 400A, 500M, 550, 550A, 558, 560, 560A, 600, 600A, 600M, 700, 700A, 700M, 760 and 768 QUICK RESPONSE:If you have any questions during use and compatibility.please send us an email.we will respond within 24hrs and help you solve it Size 0.25 inches (Pack of 2) Brand Name AMI PARTS Unit Count 2.0 Count Manufacturer AMI PARTS Model Number 4040 Blue Item Type Name 4040 Humidifier solenoid valve