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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.
B3540-4 Category Image
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Item #

Centerline

Mounting

Feature

Max Pressure

Max Temperature

Seals

Body Material

B3540-42100BN1W N/A 21" N/A 1/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42100BN2W N/A 21" N/A 3/8" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42100BN3W N/A 21" N/A 1/2" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42100BN4W N/A 21" N/A 3/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42200BA1W N/A 22" N/A 1/2"-20 N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42200BB1W N/A 22" N/A 1/2"-20 with Nuts N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42200BN1W N/A 22" N/A 1/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42200BN2W N/A 22" N/A 3/8" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42200BN3W N/A 22" N/A 1/2" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42200BN4W N/A 22" N/A 3/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42300BA1W N/A 23" N/A 1/2"-20 N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42300BB1W N/A 23" N/A 1/2"-20 with Nuts N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42300BN1W N/A 23" N/A 1/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42300BN2W N/A 23" N/A 3/8" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42300BN3W N/A 23" N/A 1/2" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42300BN4W N/A 23" N/A 3/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42400BA1W N/A 24" N/A 1/2"-20 N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42400BB1W N/A 24" N/A 1/2"-20 with Nuts N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42400BN1W N/A 24" N/A 1/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42400BN2W N/A 24" N/A 3/8" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42400BN3W N/A 24" N/A 1/2" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
B3540-42400BN4W N/A 24" N/A 3/4" Male NPT Adapters N/A Shut-Off N/A 175 PSI N/A 225° F N/A Buna-N N/A Aluminum
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