The connection can be done from the bottom (classical) and from the top which allows for hanging the gun and which is easily accessible and a quarter turn on the button will go from 0% of air flow 100%.
Always practice rather than go settle on the compressor.
I noticed a snap ring (I think dismantled?) On the pivot of the trigger. Being careful, I think the whole gun must be dismantled completely. Always practice.
I also bought the flexible spiral of the same brand.
A gun that is a joy to use!
One complaint, the ring of the above is perhaps a little hair (but I chipotte there ...)