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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

B3540-22900BB1W N/A 29" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-22900BN1W N/A 29" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-22900BN2W N/A 29" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-22900BN3W N/A 29" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-22900BN4W N/A 29" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23000BA1W N/A 30" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23000BB1W N/A 30" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23000BN1W N/A 30" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23000BN2W N/A 30" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23000BN3W N/A 30" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23000BN4W N/A 30" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23100BA1W N/A 31" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23100BB1W N/A 31" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23100BN1W N/A 31" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23100BN2W N/A 31" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23100BN3W N/A 31" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23100BN4W N/A 31" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23200BA1W N/A 32" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23200BB1W N/A 32" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23200BN1W N/A 32" N/A 1/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23200BN2W N/A 32" N/A 3/8" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23200BN3W N/A 32" N/A 1/2" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23200BN4W N/A 32" N/A 3/4" Male NPT Adapters N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23300BA1W N/A 33" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23300BB1W N/A 33" N/A 1/2"-20 with Nuts N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
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