and aging compared to standard Buna-N or neoprene seals

for applications requiring automatic shut-off in the event of glass breakage

or 4-position switching using the included stop screw and window blanks

maintaining the integrity of the vent safety shutoff system is non-negotiable for preventing flue gas spillage and potential carbon monoxide hazards

specifically the 272839-001 series

Johnson Controls A72AA-2 Temperature Control Freon and aging compared to standardThe Johnson Controls A72AA 2 Temperature Control is a heavy duty, two pole temperature switch designed for reliable refrigeration and heating operation. This DPST (Double Pole, Single Throw) controller features a vapor charged sensing element that ensures precise response to thermal changes across its 15F to 55F ( 9C to 13C) range. Built with a 6 foot capillary tubing and a 3 8" x 3" sensor bulb, it provides the versatility needed for remote mounting