Auburn H4-12-12PK Gauge Glass Refrigerant Verify the "L140-30F" stamping on

Verify the "L140-30F" stamping on your existing control to confirm a direct match for this automatic reset limit switch

though it remains functional in any environment where a 10K Ohm NTC signal is required

Precise Thermal Response: Uses a direct acting mechanism that opens on temperature rise

Zero Pressure Differential: Operates efficiently from 0 to 25 PSI without needing a minimum pressure drop

We recommend retaining your existing hardware or utilizing standard self-tapping electrical panel screws for the installation

Auburn H4-12-12PK Gauge Glass Refrigerant Verify the "L140-30F" stamping onThe Auburn H4 12 12PK Gauge Glass is a high performance borosilicate glass solution designed for critical fluid monitoring in industrial boilers and steam engines. This heavy duty sight glass features a 5 8" outer diameter (OD) and a 12 inch length, providing exceptional thermal shock resistance and durability under high pressure conditions. Each 12 pack contains high clarity tubes equipped with a distinct red line indicator, which uses optical