Resideo 121371A Copper Aquastat Well 1/2" NPT 3" Insertion Depth

The Resideo by Honeywell 121371A is a copper immersion well assembly designed for use with aquastat temperature sensors in hydronic heating systems. This well provides a protective housing that allows the aquastat bulb to accurately sense water temperature in boilers, tanks, and other pressurized vessels while preventing leaks in the controlled medium.

Key Specifications:

• 1/2" NPT threaded connection for secure installation
• 3" insertion length for optimal temperature sensing
• 3/8" internal shell diameter accommodates standard aquastat bulbs
• 1-1/2" insulation depth allows proper installation through insulated pipes and tanks
• 5/64" capillary diameter opening
• Copper construction for excellent heat conductivity and durability
• Includes mounting clamp for secure sensor attachment

This aquastat well is compatible with various Resideo/Honeywell aquastat controls including the L6006 and L8148 series. The short well design makes it ideal for applications where space is limited or where a shorter insertion depth is preferred. Professional installation by a qualified HVAC technician is recommended for proper system operation and safety.