Challenge Filler Neck Spring

Challenge Filler Neck Spring

The Challenge Filler Neck Spring is a critical component for maintaining the integrity of the water tank flapper valve assembly on rear and front discharge concrete mixers. Engineered as a double torsion spring, it provides the necessary tension to keep the flapper lid securely closed against the seal, preventing water loss during transit and operation. This spring is specifically designed to fit 4-inch and 4.25-inch flapper assemblies commonly found on Terex, Advance, Challenge, and HMC mixers. Replacing a worn or broken spring restores proper valve function, eliminating leaks and ensuring reliable water pressure for chute washdown and concrete mixing.

Key Features

• Double torsion spring design for consistent, reliable tension
• Compatible with 4-inch and 4.25-inch water tank flapper valve assemblies
• Direct replacement for Terex, Advance, Challenge, and HMC OEM springs
• Helps maintain a watertight seal to prevent tank leakage

Fits These Mixers

McNeilus, Con-Tech, CBMW, Kimble. Fits 4-inch and 4.25-inch water tank flapper valve assemblies on rear and front discharge concrete mixers, including models from Terex, Advance, Challenge, Rex, HMC, and McNeilus. Commonly used in Terex 27089 4.25-inch flapper assemblies.

All measurements ± standard manufacturing tolerance.

Product descriptions are drafted with automated tools and reviewed as time allows. While we work to keep them accurate, specifications and fitment should be confirmed with a Customer Service specialist at 800-745-3414 before purchase. Found an error? Let us know and we’ll fix it.