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The length between the center of the two bolts is referred to as the center line.  The distance between the center of the tank holes must be within 1/32” of the center line measurement.
B3540-2 Category
Items B3540-21300BA1W
B3540-21300BA1W
Aluminum Liquid Level Gage with Dial Thermometer, 13” Centerline, Front Mount 1/2"-20
B3540-21300BB1W
B3540-21300BB1W
Aluminum Liquid Level Gage with Dial Thermometer, 13” Centerline, Back Mount 1/2"-20 with Nuts
B3540-21300BN1W
B3540-21300BN1W
Aluminum Liquid Level Gage with Dial Thermometer, 13” Centerline, 1/4" Male NPT Adapters
B3540-21300BN2W
B3540-21300BN2W
Aluminum Liquid Level Gage with Dial Thermometer, 13” Centerline, 3/8" Male NPT Adapters
B3540-21300BN3W
B3540-21300BN3W
Aluminum Liquid Level Gage with Dial Thermometer, 13” Centerline, 1/2" Male NPT Adapters
Centerline N/A 13"
Mounting N/A 1/2"-20 N/A 1/2"-20 with Nuts N/A 1/4" Male NPT Adapters N/A 3/8" Male NPT Adapters N/A 1/2" Male NPT Adapters
Feature N/A Dial Thermometer
Max Pressure N/A 175 PSI
Max Temperature N/A 225° F
Seals N/A Buna-N
Body Material N/A Aluminum