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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

B3540-23300BN1W N/A 33" 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
B3540-23300BN2W N/A 33" 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
B3540-23300BN3W N/A 33" 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
B3540-23300BN4W N/A 33" 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
B3540-23400BA1W N/A 34" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23400BB1W N/A 34" 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
B3540-23400BN1W N/A 34" 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
B3540-23400BN2W N/A 34" 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
B3540-23400BN3W N/A 34" 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
B3540-23400BN4W N/A 34" 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
B3540-23500BA1W N/A 35" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23500BB1W N/A 35" 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
B3540-23500BN1W N/A 35" 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
B3540-23500BN2W N/A 35" 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
B3540-23500BN3W N/A 35" 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
B3540-23500BN4W N/A 35" 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
B3540-23600BA1W N/A 36" N/A 1/2"-20 N/A Dial Thermometer N/A 175 PSI N/A 225° Max N/A Buna-N N/A Aluminum
B3540-23600BB1W N/A 36" 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
B3540-23600BN1W N/A 36" 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
B3540-23600BN2W N/A 36" 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
B3540-23600BN3W N/A 36" 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
B3540-23600BN4W N/A 36" 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
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