Resideo - Honeywell Home 121371A Aquastat Sensor Well AssemblyResideo Honeywell Home 121371A Aquastat Sensor Well Assembly delivers precise immersion sensing for boiler controls. This immersion, capillary type sensor well provides durable copper construction and a secure 1 2 inch threaded connection for reliable installation. Key specifications include a bulb size of 3 8 inch diameter by 3 inches in length, insulation depth of 1 1 2 inches, capillary diameter 5 64 inch, and a pressure rating of 255 PSI at 300F.

it helps maintain consistent heat output and efficient combustion in typical residential setups

The McDonnell & Miller 21-30 float is a dependable replacement part for 311200 boiler controls

this blade is tailored for robust service in demanding environments

Wall-mount design compatible with 7800 Series Relay Module and S7830 Expanded Annunciator

3/4" press connections for quick

and oil with 3/4 inch threaded ports

restore efficient operation

Number of blades: 54

It features a 24 Volt voltage rating for seamless integration with standard control circuits and OEM equipment

reduces risk of failure

Packaging: Self-adjusting/spring-loaded packing

With 1" NPT connections