They just leak, I have two on my DI vessel, and after fixing the leak on my shurflo, when the pressure builds up, the inlet hose lock connector starts dripping like a maniac, no matter how far I push the hose in, or tighten it, it just leaks. Not from where the connector is with the O ring, it comes from where the hose inserts. Only if I turn the shut off pressure on the varistream to 7 instead of C it kind of stops leaking. Sheesh.
I'm buying some John Guest fittings, I've had enough of this, I don't understand how every system fitter uses them since they are rubbish.
And they are the posh looking ones as well, which Ionics uses.