BestAir A10 Series Water Pad, Metal, Suitable For: 110, 500, 550, 550A, 558 (10) Aprilaire Furnace Humidifier Models

Sturdy metal construction, replace at least once per season. Replacement furnace water pad fits Aprilaire 110, 220, 500, 550, 550A, 558 (10), BestAir BA3200G, Desert Spring DSP-PFT, Hamilton 12HF (EP037), Thermolec 500/550/Pro 600, Evolution Air Pro3000, Honeywell HE100A, HE150A, HE220A/B, HE225A/B, Lasko 5000L, 5000EC, 6000, Lennox WB2-12, WB212 and Chippewa 220.