Aprilaire

Yellow Replacement Orifice For Humidifier Models 400/500/550/558/560/568/600

2172234 MFG #: 4231
Aprilaire Yellow Replacement Orifice For Humidifier Models 400/500/550/558/560/568/600 2172234
  • Specifications
  • Description
  • Replacement orifice for Aprilaire humidifier
  • For optimum performance, replace annually
Aprilaire 4231 yellow orifice is used to accurately meter the flow of water for the Aprilaire Models 400, 400A, 400M, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 568, 600, 600A, and 600M.