My dad is the Assistant Chief at his FD. Because of that, I've scored miles and miles of firehose that failed pressure testing.
It's pretty much useless in brewing, but when it's cut and turned inside out, it makes the best gasket ever. In fact, I'm going to use some to line the holes on the conical rack in my ferment closet.
As a Paramedic, I have pretty much unlimited access to all sizes of "medical grade" O2 tanks, regulators, tubing, etc. The only thing I've walked out of work with (with permission from management, of course) is a 60mL syringe that had expired and was headed to the dumpster. Once I add a french suction cath to it, I have a "wine thief"... but I have to wait until I find one of those that's expired as well.