About the Mars 33930 Low Pressure Control, 5/30
Get a deal on the Mars 33930 Low Pressure Control, 5/30 while it's still available here at PlumbersStock.com. 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 makes reliable HVAC products that will get the job done.