Aprilaire 4231 Orifice

The AprilAire 4231 yellow orifice is a small but important nylon component which accurately meters the flow of water into your humidifier. If you determine that the rate of water flow to your AprilAire humidifier is too high or too low, check the orifice to determine if it has been damaged or dislodged. Replace the orifice if any defect is noted. Attempting to clean the hole in the orifice using pins and needles can enlarge and damage the hole. To ensure that the correct amount of water is flowing to your humidifier for maintaining recommended humidity levels in your home, always use the correct orifice replacement part unique to your model humidifier. Yellow Orifice 4231 is intended for a flow rate of 3GPH (gallons per hour) and is used in Models 400, 400A, 400M, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 568, 600, 600A, and 600M.

Order Processing: After your payment is authorized and verified, we will start processing your order and this process can take from 1 to 2 business days, so please be patient with us. If we are unable to process your order due to inaccurate or incomplete payment or incorrect address information, your order processing may be delayed.

Carrier: UPS/FedEx/USPS. Delivery Timescale: More than 90% of orders arrive in 10 business days after despatch.

FREE RETURNS on all orders!
The following conditions must be met:

1. Items must be returned within 30 days after the purchase date.
2. Items must be unworn, undamaged and in original packaging.