I have worked on D&S self serve equipment that I was told was developed with Hydraflex, and uses a lot of the same components. Injector failures are common, there are a lot of injectors, and they are expensive. I'd take
Flojets any day over the troubles these guys are having with failed injectors and solenoids. Also, I really wouldn't want to rely on one pump for everything. If I had that system and needed a replacement pump, it could possibly take a week right now.
If you're having a lot of failures with
Flojets, try tightening the screws before you install them. I started doing that about fifteen years ago, and between that and making sure the air supply is clean and dry, I never get less than five years out of them. I keep two spares, and with the quick-change mount it takes less than a minute to swap one out.