Please research before following advice from some co-called experts on youtube

Your sir are correct! Be careful with hpa and pay attention. 
And if your saying that someone pieced together a fill station from home depot that's nuts haha. 
I would suggest looking at something like McMaster carr and just ordering hpa fittings. 

Agree 100% with blackdiesel. Your fittings and components should be rated for a SWP (safe working pressure) of at least 4500 psi. Even the components you buy from Chinese sources on eBay or AliExpress should state the working pressure ratings. If they don't, then don't buy them.

you are a thousand times right and every now and then we need somebody to say hey realize how dangerous that can be if you screw around... good job... nobody wants to out anyone... its not in many of us to do ,,but bad info ...someone needs to put a stop to the bad info ,,,,if it was a vid u seen i wish they would pull it,,,, pat

To drive the point home a youtube video on hpa items purposely desroyed in a safe manner would be a good idea. Any youtubers up for the challenge

Very good point, here's a video that shows how much potential energy our "toys" have.

@blackdiesel, + to you for the safety reminder! 
Tom

Truer words have never been written BlackDiesel

When I first started working as a Respiratory Therapist, hospitals were still using compressed gas cylinders as a source of bed side oxygen. Yeah, I am that old. Anyway, being a 'tank jockey' was part of the job back then, and it taught me an abiding respect for what 3000 psi can do. Saw a 250 cu ft H cylinder dropped of the back of a delivery truck. Snapped the valve stem and turned the cylinder into a 100 lb torpedo that went up our ER ramp and through an exterior brick wall.

The F14 used 3000 PSI hydraulic fluid systems to run its flight controls and landing gear doors. While on a "drop test" where we put the aircraft on stands, take the weight off the wheels and run the landing gear up and down, someone bypassed a limit switch which told the computer when the gear was down and NOT to close the doors..when with that switch bypassed the guy in the cockpit tried to raise the gear, the gear didnt move but the bay doors attempted to close.. the door edge struck a line and caused a tiny 2 foot long jet of fluid to shoot out and struck a guys arm..it was like he put it into a band saw... Not only did it cut his arm, it injected the hydraulic fluid into his arm and pulled the skin up and away from the muscle, like a pants pocket in his arm. He didnt feel a thing until it was all over.

Compressed air is no joke. Even at 110 psi it contains a lot of energy.. My company mfg's and sells OSHA Compliant blow guns. These are used to blow off dust etc.. I'm told that years back the workers at GM used to sneak up on fellow workers would "goose" fellow workers with the tip of a blow gun and used compressed air. At times oil would be in the compressed air and it would be "injected" into the skin causing a lot of issues. Now, all blow guns must not be able to build more than 30 psi at the tip. thus OSHA compliant.. 
Our HPA is some serious stored energy and I always take my time when filling my reservoir. . 

….. 

I’ve had a seven ltl air cylinder go bang in my Landrover thankfully no one was in it at the time when it went off I honestly though that some one had blown it up as I had just returned from deployment to Iraq. I was as if some one had thrown a hand full of TNT in to the Landrover.

I had the police fire service and bomb squad out not a thing done lightly. After lots of testing they found that the neck of the bottle had a slight hair line crack on it even though it was a brand new bottle.

Now if I and my Familie had been in it we could have been killed and or badly injured.

Thankfuly I had for sports use on my car insurance which covered the damage.

I now have a Samsonite case that the bottle lives in when at home the bottle lives in a steel cabinet. Please for the love of good do not mess with HPA it is a killer just waiting to be let out of the box.

Very good points, all! Even my Crosman 160 Pellgun that uses two 12g Co2 cartridges could be dangerous! Those two Co2 cartridges pressurize the gas tube to some 900PSI! That' is definitely nothing to play around with! Use top grade parts and seals where needed and play it smart and safe. Your family will thank you!