McMaster Carr is the place to order from.Solitude Diver wrote: Make sure you purchase several intermediate fittings to install and “open” the hose for in between dive use when not wearing the drysuit.
I have both "valved" and "non-valved" Quick Disconnects; frankly, the important one you have a "no leak" valve on is the female side for the suit hose. The male side is nice, but it's more of a flow-restriction, if you will, and I found that as long as I'm careful unclicking, it's not a problem to not have the male part with a no-leak valve...and it's a LOT more convenient to not have to go looking for the no-valve female piece in the save a dive kit during the surface interval.
In any case, buy a few of them when you order, you'll lose them at an inopportune time
As much as I usually hate to say anything nice about Halcyon gear this is one situation where their neoprene hose beats out the vinyl hoses that most other brands use. It's unbelievably kink resistant, which is a very good thing in this environment. Kinks are dangerous - if you don't "blow out," you run the risk of backpressure which can lead to a UTI and also just be very painful.Just pay particular attention to make sure you have no kinks in the line once the suit “squeezes”. Not only uncomfortable, but high risk for “blowout” when using.
I'll third the Rochester Wideband recommendations. Good grip, and good grief when it comes time to get 'em off. I also find it helpful to snip the tip "hose" off a bit before putting the quick connect barb in place. That leaves less silicone which can kink...ideally that section of the cath is _just_ long enough to hold the hose barb without it rubbing and irritating you somewhere where it ought not to...