The 1/2" MPT Flow Switch (HW-Q12DSMSC) is a reliable replacement flow-detection component designed for spa and hot tub systems, confirming adequate water flow before allowing the heater or other equipment to operate.

Specifications:

• OEM part number: HW-Q12DSMSC
• Manufacturer: Hydro Quip
• Connection: 1/2" MPT (male pipe thread), fits tees or heater unions on 1.5" or 2" plumbing
• Flow range: Approximately 16–23 GPM, suitable for most spa applications
• Power requirement: Approximately 0.5A, compatible with common spa control systems
• Design family: Based on the widely used Q-12 series flow switch design
• Construction: Durable materials built to withstand continuous heat, moisture, and chemically treated water

Fits/replaces:

• Spa and hot tub systems using a 1/2" MPT flow switch
• Direct OEM replacement for part HW-Q12DSMSC
• Always verify thread size, flow rating, and connection type before ordering

Common signs you need this part:

• Heater fails to activate despite adequate water flow
• Flow-related fault codes on the control panel
• Spa functions interrupted intermittently during operation

Returns & installation: Please verify your system's thread size, flow rating, and connection type before ordering. Installation should be performed by a qualified spa technician with power and water disconnected.

FAQ

Q: What is the flow range of this switch?
A: It typically operates within a range of approximately 16–23 GPM.

Q: What connection type does this switch use?
A: It uses a 1/2" MPT (male pipe thread) connection.