Mars 33959 High-Pressure Cut-Out Control, 450-250

About the Mars 33959 High-Pressure Cut-Out Control, 450-250

Get a discount deal on the Mars 33959 High-Pressure Cut-Out Control, 450-250 here at PlumbersStock. A pressure switch senses negative pressure in a furnace and shuts it down as a safety measure against harmful fumes and gas leaks. It's easy to replace. Mars is a popular HVAC brand among both homeowners and contractors for good reason.