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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.
B3540-1 Product Category
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Item #

Centerline

Mounting

Feature

Max Pressure

Max Temperature

Seals

Body Material

B3540-12800BB1W N/A 28" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12800BA2W N/A 28" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12800BM1W N/A 28" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12800BN1W N/A 28" N/A 1/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12800BN2W N/A 28" N/A 3/8" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12800BN3W N/A 28" N/A 1/2" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12800BN4W N/A 28" N/A 3/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BA1W N/A 29" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BB1W N/A 29" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BA2W N/A 29" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BM1W N/A 29" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BN1W N/A 29" N/A 1/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BN2W N/A 29" N/A 3/8" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BN3W N/A 29" N/A 1/2" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-12900BN4W N/A 29" N/A 3/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BA1W N/A 30" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BB1W N/A 30" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BA2W N/A 30" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BM1W N/A 30" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BN1W N/A 30" N/A 1/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BN2W N/A 30" N/A 3/8" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BN3W N/A 30" N/A 1/2" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13000BN4W N/A 30" N/A 3/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13100BA1W N/A 31" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
B3540-13100BB1W N/A 31" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° N/A Buna-N N/A Aluminum
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