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About The Aprilaire 4004 Humidifier Drain Type InLine Strainer The Aprilaire 4004 Humidifier Drain Type InLine Strainer is a replacement part that is a small strainer that fits into the inlet fitting of your water solenoid valve. The Aprilaire 4004 Humidifier Drain Type InLine Strainer allows water to enter your humidifier or stops the water flow. The Aprilaire 4004 Humidifier Drain Type InLine Strainer is made to keep debris for entering the solenoid valve and needs to be checked at least once a year for mineral and grit buildup. The Aprilaire 4004 Humidifier Drain Type InLine Strainer is designed for use with Aprilaire models 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 550, 550A, 558, 560, 560A, 568, 600, 700, 760, 760A amp; 768.

Aprilaire 4004 Humidifier Drain Type In-Line Strainer - B00CX9C15S