The P170NA-1 is a pressure control switch designed for use in HVAC systems. It features a manual reset switch and can handle pressures ranging from 20 inches of water column to 100 pounds per square inch on the low side, and from 100 to 425 pounds per square inch on the high side. This switch is reliable and durable, making it an ideal choice for HVAC service technicians looking for a high-quality pressure control solution.