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The 4004 Humidifier Drain Type InLine Strainer Keep your humidifier running smoothly with our essential replacement part. The 4004 In-Line Strainer fits perfectly into the inlet fitting of your water solenoid valve, ensuring that water flows seamlessly into your humidifier while preventing debris from causing damage. Debris Protection:Keeps your solenoid valve free from mineral and grit buildup. Easy Maintenance: Check at least once a year for optimal performance. Compatible Models: Works with Aprilaire models 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 550, 550A, 558, 560, 560A, 568, 600, 700, 760, 760A & 768.