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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

B3540-20700BB1W N/A 7" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20700BN1W N/A 7" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20700BN2W N/A 7" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20700BN3W N/A 7" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20700BN4W N/A 7" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20800BA1W N/A 8" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20800BB1W N/A 8" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20800BN1W N/A 8" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20800BN2W N/A 8" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20800BN3W N/A 8" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20800BN4W N/A 8" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20900BA1W N/A 9" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20900BB1W N/A 9" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20900BN1W N/A 9" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20900BN2W N/A 9" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20900BN3W N/A 9" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-20900BN4W N/A 9" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21000BA1W N/A 10" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21000BB1W N/A 10" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21000BN1W N/A 10" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21000BN2W N/A 10" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21000BN3W N/A 10" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21000BN4W N/A 10" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21100BA1W N/A 11" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-21100BB1W N/A 11" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
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