Restore the performance of your WaterBoss water softener with this genuine OEM Drive End Cap Assembly, designed for WaterBoss AMS 700, AMS 900, and AMS 950 water softeners. This critical control valve component houses and supports the piston assembly, directing water through each stage of the regeneration cycle for reliable, efficient softening.

A cracked, worn, or damaged drive end cap can cause water leaks, regeneration problems, and reduced softening performance. Replacing it with a genuine OEM part helps restore proper valve operation and keep your system running as intended.

✔️ Genuine OEM WaterBoss replacement part for a precise fit and dependable performance

✔️ Fits WaterBoss AMS 700, AMS 900, and AMS 950 water softeners

✔️ Compatible with AquaMaster systems using OEM Part #54520

✔️ Helps restore proper regeneration cycles and reliable valve operation

✔️ Easy DIY installation with our step-by-step replacement video

Common signs you may need a new Drive End Cap Assembly:

• • Water leaking from the control valve or drive end cap
• • Water softener not regenerating properly
• • Cracked or damaged drive end cap assembly
• • Reduced water softening performance due to valve issues

Part Number: 54520

Looking for AquaMaster parts?

In the United States, AquaMaster water softeners are sold under the WaterBoss brand. If you're replacing a part on an AquaMaster system, the most important thing to match is the part number.

If your existing part is #54520, this is the correct genuine OEM replacement whether your system is branded WaterBoss or AquaMaster.

Not sure if this is the right part? Contact our water treatment specialists before ordering and we'll help you verify compatibility with your system.