4231 AP-4231 Aprilaire Humidifier Yellow Water Orifice 500 500 500A 550 600 600A

  • This Item is used in Aprilaire Humidifier Models: 400, 400A, 500, 500A, 550, 560, 600, 600A, 600M

This is a BRAND NEW OEM Aprilaire Humidifier Yellow Water Orifice.  This simple but critical part regulates the flow of water into the humidifier. Over time it can become clogged with sediments or mineral deposits.  It should be replaced annually for optimum performance.  Be sure to clean or replace your In Line Strainer (Aprilaire part # AP-4231) when you replace the orifice.