Aprilaire 4004 drain type inline strainer, the replacement strainer that fits into the inlet fitting of your humidifier's water solenoid valve. It lets water flow to the humidifier while keeping debris out of the solenoid valve; check it at least once a year for mineral and grit buildup.
- Fits into the inlet fitting of the water solenoid valve
- Keeps debris from entering the solenoid valve
- Check at least once a year for mineral and grit buildup
Compatible with: Aprilaire 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 550, 550A, 558, 560, 560A, 568, 600, 700, 760, 760A, 768