I remember that the first time I learned of a JBL was in the early 80's. An outfit called Roxbury/Platinum Press sold enema supplies, and somehow had come upon some original JBL bags. They were selling them in the neighborhood of around $125. This seemed like a whole lot of money at the time, so I passed on the opportunity.
I later regretted this, so by about the mid to late 80's, I made my own. This was long before the reproductions came about.
Because I was always aware of reflux with my hot water bottle, I had made my own check valves to keep my bag clean. So I knew that with a JBL, it seemed almost a sure thing that reflux was going to happen.
When I made the snap-in nozzle for my JBL, I integrated the check valve right into it. Because of this, there is no chance of contamination.
I can't see why Klystra doesn't see this problem and design a nozzle like mine .......... it's a no-brainer. There's simply no way the JBL doesn't get some contamination without a check valve.
Period.
I've purchased a Klystra JBL quite some time ago, but haven't gotten around to fabricating a nozzle with a check valve for it .......... maybe one of these days when I find a little time.
Meanwhile, the one I fabricated still gets some use ........... it's now almost 30 years old.
Ah, yes. Good times ..............