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The Aprilaire 4223 Drain Spud is the plastic fitting that attaches to the base of the housing of your humidifier and is designed to connect to a 1/2 inch O.D. drain hose. Compatible Models 500, 500A, 500 M 600, 600A, 600M
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🇺🇸 Ship from USA · On Agora since 2026
$9.49