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An detail of part of a mockup of the Hubble Space Telescope aft bulkhead.

This mockup is located near the centrifuge

On the HST, the aft bulkhead contains umbilical connections between HST and the shuttle, and it is used during on-orbit maintenance. It is made of 2-inch-thick honeycombed aluminum panels and has three radial aluminum support beams.

The "handles" along the yellow lines mate with the flight support system in the cargo bay.

Page 5-6 of the Hubble Space Telescope Servicing Mission 3A Media Reference Guide [direct link to 695K PDF] (p. 6 of the PDF) contains a diagram of the aft bulkhead.