Part Description:
The Drive Piston is a central component of the Drive End Cap Assembly of WaterBoss, AquaMaster, and AquaMaster PRO water softeners. It moves back and forth inside the valve body to control the flow of water during service and regeneration cycles. Designed for durability and precision, the drive piston ensures seamless transitions between softening, brining, backwashing, and rinsing phases.
Function & Importance:
Controls water flow paths within the softener valve
Coordinates timing and cycling during regeneration
Ensures smooth transitions between modes of operation
Works in sync with the drive motor and gear system
Critical for delivering soft water on demand and consistent system performance
Common Signs of Issues:
Softener stuck in regeneration or skipping cycles
Hard water despite recent regeneration
Unusual noises during cycling
Leaks or water bypassing the valve
Compatible With:
WaterBoss 700, 900, and 950
AquaMaster 700, 900, and 950
AquaMaster PRO 5000, 5100, and 5500
Installation Tips:
Disconnect power and water supply before service
Inspect O-rings and seals during replacement
Lubricate with food-grade silicone grease to reduce friction
Ensure proper alignment with gear assembly before reassembly
Replace any worn O-rings with a fresh kit for optimal sealing
Why It Matters:
The drive piston is the "valve director" of your softener — when it wears out or becomes damaged, the entire system can lose functionality. Replacing the drive piston restores precision control over regeneration and soft water delivery, keeping your system running smoothly and your water perfectly conditioned. Please call technical support first to ensure this is the correct part for the issue your softener may be experiencing 1-800-437-8993 (EST).
Part Description:
The Drive Piston is a central component of the Drive End Cap Assembly of WaterBoss, AquaMaster, and AquaMaster PRO water softeners. It moves back and forth inside the valve body to control the flow of water during service and regeneration cycles. Designed for durability and precision, the drive piston ensures seamless transitions between softening, brining, backwashing, and rinsing phases.
Function & Importance:
Controls water flow paths within the softener valve
Coordinates timing and cycling during regeneration
Ensures smooth transitions between modes of operation
Works in sync with the drive motor and gear system
Critical for delivering soft water on demand and consistent system performance
Common Signs of Issues:
Softener stuck in regeneration or skipping cycles
Hard water despite recent regeneration
Unusual noises during cycling
Leaks or water bypassing the valve
Compatible With:
WaterBoss 700, 900, and 950
AquaMaster 700, 900, and 950
AquaMaster PRO 5000, 5100, and 5500
Installation Tips:
Disconnect power and water supply before service
Inspect O-rings and seals during replacement
Lubricate with food-grade silicone grease to reduce friction
Ensure proper alignment with gear assembly before reassembly
Replace any worn O-rings with a fresh kit for optimal sealing
Why It Matters:
The drive piston is the "valve director" of your softener — when it wears out or becomes damaged, the entire system can lose functionality. Replacing the drive piston restores precision control over regeneration and soft water delivery, keeping your system running smoothly and your water perfectly conditioned. Please call technical support first to ensure this is the correct part for the issue your softener may be experiencing 1-800-437-8993 (EST).
