A follow up to what length are your hoses

[blue steal]

I thought I had a pretty comprehensive save-a-dive kit, but I am going to add several sizes of O-rings for everything I use.
Hate to not get a dive in because of an O-ring.
Thanks scubafanatic,, I have ordered quite a bit of stuff from dive gear express, they are a great outfit to deal with.

 

[Marek K]

my save-a-dive kit only had a few tank O-rings and a few tiny ones (what the heck are these for)

The tiny ones should be for an SPG spool. That's the rod-like bit at the junction of the HP hose and the SPG that allows the SPG to swivel; uses one of the tiny o-rings at each end.

See for example here, about 3/4 of the way down under "SPG Components." Spools come in different shapes, but I think almost all use the same tiny 003-size o-rings.