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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

B3540-10300BA1W N/A 3" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10300BB1W N/A 3" 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
B3540-10300BA2W N/A 3" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10300BM1W N/A 3" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10300BN1W N/A 3" 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
B3540-10300BN2W N/A 3" 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
B3540-10300BN3W N/A 3" 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
B3540-10300BN4W N/A 3" 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
B3540-10400BA1W N/A 4" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10400BB1W N/A 4" 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
B3540-10400BA2W N/A 4" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10400BM1W N/A 4" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10400BN1W N/A 4" 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
B3540-10400BN2W N/A 4" 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
B3540-10400BN3W N/A 4" 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
B3540-10400BN4W N/A 4" 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
B3540-10500BA1W N/A 5" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10500BB1W N/A 5" 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
B3540-10500BA2W N/A 5" N/A 1/2"-13 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10500BM1W N/A 5" N/A M12 X 1.75 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-10500BN1W N/A 5" 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
B3540-10500BN2W N/A 5" 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
B3540-10500BN3W N/A 5" 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
B3540-10500BN4W N/A 5" 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
B3540-10600BA1W N/A 6" N/A 1/2"-20 N/A Standard N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
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