What Material are the Bypass Valve and Valve Head Made of? January 31, 2025 16:44 Updated They are made of a plastic called Celcon and both products are NSF stamped. Bypass Valve: Valve Head: Related articles How Much Resin Should Be in the Tank? Common signs that your water softener is no longer working The Do-It-Yourself (DIY) Water Softener Installation Checklist Replacing Your Kenmore Softener Welcome to the Kenmore Water Softener Family