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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

B3540-11600BB1W N/A 16" 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
B3540-11600BA2W N/A 16" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11600BM1W N/A 16" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11600BN1W N/A 16" 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
B3540-11600BN2W N/A 16" 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
B3540-11600BN3W N/A 16" 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
B3540-11600BN4W N/A 16" 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
B3540-11700BA1W N/A 17" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11700BB1W N/A 17" 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
B3540-11700BA2W N/A 17" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11700BM1W N/A 17" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11700BN1W N/A 17" 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
B3540-11700BN2W N/A 17" 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
B3540-11700BN3W N/A 17" 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
B3540-11700BN4W N/A 17" 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
B3540-11800BA1W N/A 18" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11800BB1W N/A 18" 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
B3540-11800BA2W N/A 18" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11800BM1W N/A 18" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11800BN1W N/A 18" 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
B3540-11800BN2W N/A 18" 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
B3540-11800BN3W N/A 18" 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
B3540-11800BN4W N/A 18" 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
B3540-11900BA1W N/A 19" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-11900BB1W N/A 19" 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
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