which corresponds to the 5/8" nominal size used in standard plumbing

this SPST limit switch is built for the rugged demands of commercial and industrial gas-fired heating equipment

Industrial Durability: Resilient against the dry heat and rapid shifts in ambient temperature typical of commercial warehouse environments

While some technicians attempt to clear debris with compressed air

Corrosion Resistance: Durable powder-painted exterior withstands 500 hours of salt spray testing

Johnson Controls T-4000-2639 Cover which corresponds to the 5/8"Johnson Controls T 4000 2639 Gold Plastic Cover, Horizontal, No Thermometer or Setpoint Window, Johnson Controls Labeled