Other ***Safety issue read***

All good advice.
I actually also use small, plastic-coated cables with looped ends and carabiners to fasten them to parts of my rifle in case of an errant connection popping-off. A popped end can only go as far as the short cable, about 8" in my case.
Overkill? It's just my way of using another safety device.

Mike
 
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hardairmagazine.com/buyers-guides/hpa-fittings-warning-if-you-have-a-pcp-you-need-to-read-this
Copy and Paste
One of the things old Navy Divers understand is that H.P. lines can and will fail.
Solution, don't be lazy, attach a whip line anchor line to one end of the fill hose and anchor it to an imovable object to prevent (whip injuries) when filling H.P. cylinder with a H.P. hose.
 
Do you have any links? I know I've seen these somewhere but I can't find them now.
its very simple to make... two snap rings on a piece of short line.
Snap one ring to the air bottles fill hose discharge end, snap the other ring onto your gun or a solid object that isn't going anywhere quickly.
they don't need to be elaborate... short is better. i've seen zip ties to secure the rings and snaps as all your doing is stopping the initial H.P. fitting from whipping towards your brain bucket or eyeball.
 
meh .. respect hpa .. mainly, fittings should work 'positively' and not be stiff, collars should snap into place etc, a fitting that is stiff to lock into place is just asking to blow off .... other than that id say filling tanks to 45+ is the real danger, steel is better than brass and rule of thumb is 'avoid' close proximity as much as possible - its doubtful you will get injured 10 foot away, but if a fitting grenades and youre 1 foot away hovering over it your getting f'd up guaranteed ..
 
I used something very similar to these:

You can find some with loops already on each end, or buy some line marriers to make your own loops and crimp them in place.

Mike