The "VL" designation confirms an integral vent limiting orifice

What causes this valve to drip or leak

featuring an outer circumference of 46 inches and a top width of 1/2 inch (A-section)

making it a versatile HVAC replacement part for technicians performing field service or preventative maintenance

which enables seamless conversion from threaded 2CH thermocouples to snap-in 2C thermocouple styles

McDonnell & Miller 169 Low Water Cut Off Refrigerant The "VL" designation confirms anMcDonnell & Miller 169 2 1 2" NPT, 3 1 8" Insertion Length, 20 PSI Max Steam Pressure, Auto Reset Mechanical Low Water Cut Off for Steam Boilers (Part Number 155100)