Aprilaire Genuine OEM Drain Spud No. 4223 for Models: 500 & 600 by Aprilaire;
Aprilaire Genuine OEM Drain Spud No. 4223 for Models: 500 & 600 by Aprilaire

Fits all 500 & 600 series humidifiers including models: 500, 500A, 500M, 550, 560, 600, 600A, 600M.

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Fits all 500 & 600 series humidifiers including models: 500, 500A, 500M, 550, 560, 600, 600A, 600M.

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