Aprilaire #10 Water Panel (RP #10). Fits the Aprilaire model 110, 220, 500, 500A, 500M, 550, 550A & 558 humidifiers as well as the Lennox WB2-12 bypass humidifier. Your humidifier water panel should be replaced at least one time per year to maintain adequate humidifier performance.

Dimensions: 9-1/5" x 9-3/4" x 1-5/8"
Actual Dimensions: 9-1/5" x 9-1/5" x 1 5/8"

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