ACME Bulkhead Risers allow containment boom to ride varying water levels – rising and lowering along the length of a vertical, 4″ x 4″ flange-beam (customer-supplied and installed). Bulkhead Connectors are shipped from the plant completely assembled. If the top of the flange beam is open, the connector can simply be slipped down over the top. If the beam is not open, remove four bolts holding the connector’s roller arms together and reassemble on the beam. ACME Bulkhead Connectors come ready to connect to any boom (up to 6″-dia. flotation x 12″ skirt) equipped with an ACME Quick Latch coupler.