BOX COUPLERS are predominately utilized in laboratory applications. 

ESI-810
Eight Stub Box Coupler - BJ77 (3 lug) Connector
ESI-810
ESI-811
Eight Stub Box Coupler - BJ77 Connector, 4 each side
ESI-811
ESI-812
Eight Stub Box Coupler - BJ77 Connector, bus and stub on top
ESI-812
Internally Terminated
Other internally terminated 8 stub couplers
Internally Terminated