Feed Tube with Sleeve for 400/500/600

Details

Model: 4335
Manufacturer: Aprilaire
Part Number: 1903370
Description: Feed Tube with Sleeve for Models 400, 400A, 400M, 500, 500A, 500M, 600, 600A, and 600M Humidifiers.

Product Overview

The Aprilaire 4335 Feed Tube Assembly is a factory-engineered replacement component for direct application in Aprilaire Model 400, 400A, 400M, 500, 500A, 500M, 600, 600A, and 600M series humidifiers. This component facilitates the transfer of controlled water volume from the solenoid valve to the upper water distribution tray. Constructed from high-grade plastic tubing with precision-formed dimensions, it ensures leak-free water conveyance under continuous humidifier operation. The assembly includes a compression sleeve and nut for secure connection, as well as integral filtration and flow control elements to maintain consistent system performance.

Technical Specifications

• Material: High-strength plastic tubing
• Inner Diameter (ID): 11/64 inch
• Outer Diameter (OD): 1/4 inch
• Length: 22 inches
• Included Components:
  • #4004 In-Line Strainer
  • #4231 Yellow Orifice
  • Compression Sleeve
  • Compression Nut
• Operating Function: Water feed conduit between solenoid valve and distribution tray
• System Compatibility: Aprilaire Humidifier Models 400 / 400A / 400M / 500 / 500A / 500M / 600 / 600A / 600M
• Installation Interface: Compression fitting assembly

Installation Notes

• Disconnect power and water supply prior to installation.
• Ensure all compression fittings are properly seated and tightened to specification to prevent leaks.
• Confirm correct flow orientation through the in-line strainer and orifice assembly.
• Verify system functionality post-installation by testing solenoid activation and water delivery to the distribution tray.

Summary

The Aprilaire 4335 Feed Tube Assembly is an OEM-grade component designed for precise replacement and long-term reliability in compatible Aprilaire humidifier systems. The assembly integrates all required fittings, flow control, and filtration elements for efficient and secure installation within hydronic and forced-air humidification applications.