The figure 8 seals the housing up.
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I thought it was strange to find so much junk that came out of the booster, I'd just done a power steering system purge last year but thinking back I only pushed fresh fluid through the box and not the booster. It went right back together as easily as it came apart. I really don't know why folks bother taking them out if they're just going to be lazy like me and do the 2 seals. There was a problem though. I managed to make the leak much worse. I tore the damned piston seal when reassembling the thing and turned an ignorable leak into something so bad I couldn't even drive the truck. Were I back home, no big deal, go park the thing and let it sit until a new seal kit shows up in the mail in 2 days. Out here in Commiefornia? No 2 day shipping, and I head back home this Friday. So I had the privilege Sunday of handing over $400 to Napa for an overpriced reman. F me. Got that all back in and the truck is back with a slightly improved pedal feel. I'm thinking the original could use a full on rebuild, so I'll get another seal kit coming and do just that. Gotta figure out how the back half comes apart, I read on a Duramax forum it's a real asspain. Oh, and when I put it back together the first time and it started leaking I made a HUGE mess in the driveway. And forgot to run the accumulator down before 2nd disassembly because I was pissed and it sprayed everywhere.
Forgot to mention this little bass turd.
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I don't ever recall encountering one of these on any other truck before. If there's a trick to it I didn't find it, I ended up shoving 2 picks in there and prying it open just enough to get the thing out of its ridge.