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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

B3540-11900BA2W N/A 19" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11900BM1W N/A 19" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11900BN1W N/A 19" N/A 1/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11900BN2W N/A 19" N/A 3/8" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11900BN3W N/A 19" N/A 1/2" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11900BN4W N/A 19" N/A 3/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BA1W N/A 20" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BB1W N/A 20" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BA2W N/A 20" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BM1W N/A 20" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BN1W N/A 20" N/A 1/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BN2W N/A 20" N/A 3/8" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BN3W N/A 20" N/A 1/2" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12000BN4W N/A 20" N/A 3/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BA1W N/A 21" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BB1W N/A 21" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BA2W N/A 21" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BM1W N/A 21" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BN1W N/A 21" N/A 1/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BN2W N/A 21" N/A 3/8" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BN3W N/A 21" N/A 1/2" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12100BN4W N/A 21" N/A 3/4" Male NPT Adapters N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12200BA1W N/A 22" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12200BB1W N/A 22" N/A 1/2"-20 with Nuts N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-12200BA2W N/A 22" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
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