Ok, an update from Wyatt and Brian at Ed Gun West.
Tips for EzAy fill users: Do not leave EZ fill on your fill tank valet open and/or pressurized over night. Also, you can safely fill guns to 250 BAR ( not greater) and it should work as designed. Do NOT leave valve open after you fill your rifle to max fill pressure. Be sure to close the valve on your big tank.
After thinking more about this 250 bar "recommendation," the more ridiculous and nonsensical I think it is (no offense to you Tom as you were sharing what they said - it's meant for EdGun . . . ).
This device is intended to be used on the output of an SCBA tank to control the amount of air being fed into guns. So by definition, and by design it will be put on full SCBA tanks that will have the valve opened with full pressure applied to the device - so up to 310 bar from a full tank, restraining it all against no restriction until hooked to a gun and opened up to flow air. That is the highest load it will see - when not actually flowing air. If EdGun was worried about the strress of flowing air rather than static load, the worst condition would be filling an empty tank from a full SCBA - a 310 bar active "flowing load" into a zero bar reservoir. As the reservoir fills, the flowing differential drops and thus the flowing load would drop. Stopping at 250 bar leaves a flowing load of ~50 bar, followed by up to ~300 bar "static load" as soon as the valve closes as the 250 bar would be vented - which is the same load the device saw before the fill (technically a bit less as some air from the tank would have been sent to the gun). Filling guns to higher pressures should be no more stress on the fill device as the flow will eventually balance with no "flowing load" occuring at all (which is what happens with high fill guns like thir L2). Do they honestly believe that their "durability issues" are caused by the air that has already flown through the valve?
Bottom line, I think they are just making excuses, as their statements don't even stand up to the physics involved in what they are talking about. So if they are having durability issues, the device is under designed, it is not being misused by anyone, even if the line is left charged for long periods of time - do we expect our SCBA valves to fail because the tanks are full for long periods of time? I'll admit that venting the line when not in use is probably a good safety practice, but it should not be required for longevity of their fill device. If they are having durability issues, EdGun needs to get their act together and either fix or recall the products (or at least offer a discounted exchange program to current owners on an improved version).
I plan to continue to use mine, and may repair it at least once if needed as I already have one repair kit, but I certainly won't be buying another unless it is fixed in the future - nor any other EdGun products, for that matter . . . That said, if it ever does anything I feel is unsafe it will be in the trash ASAP.