Measuring pressure and pumping air

[zmajmr]

How to measure pressure in pneumatic speargun with any problems, no air leaks, even on high pressure.
Same O-ring can be used when pumping the pressure inside of gun with manual hand pump.

[ame=http://www.youtube.com/watch?v=5OKuT12VztY]10-6-2 NBR O-ring in pneumatic speargun - YouTube[/ame]

 

[tromic]

This trick with the O-ring is the best Markos trick for pneumatic. Very helpful indeed. I noticed the problem first time when I was measuring the pressure in my Cyrano on 25 bar and wanted to take a picture of it. After maybe 20 seconds the air begun to leak passing by the sealing O-ring on manometer. I was using manometer that I bought from Kara-yo, the man who invented and produce the famous Tovarich kit. Marko made his manometer but he had a same problem with it. It seams the the O-ring used for sealing was not hard enough. It was regular NBR o-ring. Putting O-ring also is helpful while one use the hand pump to pressurize the gun.

 

[Don Paul]

That is the same way I sealed a bayonet type coupling I tooled for my Mares Bazooka when I didn't have a proper pump connection for a standard pump.
Nice work Marco.

Cheers, Don