There is no technical difference in fitment or function

the 0009865 is the upgraded lead free version of the 0821405

Integrated Water Seal: Prevents harmful combustion gases and odors from back-feeding into the structure through the drainage piping

Always verify the part number on your existing limit to ensure the thermal cutout points align with your specific unit's safety requirements

MAMAC Systems TE-703-C-5-A-2 Sensor There is no technical differenceThe MAMAC Systems TE 703 C 5 A 2 is a professional grade immersion temperature sensor specifically engineered for high accuracy monitoring in chilled water, hot water, and low pressure steam loops. This model features a high precision 1,000 Ohm Balco RTD sensor, delivering a positive temperature coefficient that ensures stable and repeatable resistance outputs across a wide operating range of 40F to 210F. The 4 inch 304 stainless steel probe is