Dwyer 1900-5-MR is a compact low differential pressure switch designed for air and non-combustible gases. It has a temperature range of -30 to 180°F and is capable of withstanding pressures up to 45" w.c. The switch has a single-pole double-throw configuration with a 15 A electrical rating. The diaphragm should be positioned vertically, and the process connection is a 1/8" female NPT.