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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
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Item #

Centerline

Mounting

Feature

Max Pressure

Max Temperature

Seals

Body Material

B3540-21300BA1W N/A 13" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21300BB1W N/A 13" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21300BN1W N/A 13" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21300BN2W N/A 13" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21300BN3W N/A 13" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21300BN4W N/A 13" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21400BA1W N/A 14" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21400BB1W N/A 14" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21400BN1W N/A 14" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21400BN2W N/A 14" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21400BN3W N/A 14" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21400BN4W N/A 14" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21500BA1W N/A 15" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21500BB1W N/A 15" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21500BN1W N/A 15" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21500BN2W N/A 15" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21500BN3W N/A 15" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21500BN4W N/A 15" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21600BA1W N/A 16" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21600BB1W N/A 16" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21600BN1W N/A 16" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21600BN2W N/A 16" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21600BN3W N/A 16" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21600BN4W N/A 16" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-21700BA1W N/A 17" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
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