Used L-com CIB24BA Female to Male Bulkhead Adapter/Connector, suitable for IEEE-488/GPIB/HPIB 24-pin connections. 
Pulled from working environment. 

These innovative bulkhead adapters allow the user to pass GPIB cables through a panel or enclosure. Utilizing a unique steel/nickel plated mounting flange and cast aluminum connector housing, these adapters are built to last. 

Features
  • Cast aluminum housing provides strength, durability and crush resistance
  • IEEE-488 compliant
  • Metal mounting flange accommodates grounding requirements
  • Feed any IEEE-488/GPIB cable through a panel or enclosure
  • Gold plated contacts insure reliability, signal integrity and multiple mating cycles
Application
  • Data Acquisition
  • Instrument Control
  • Test and Measurement