Kral NP03 o-ring help

[Ed24]

My NP03 is leaking air when filling. It will hold air until it gets to about 170bar then starts leaking where the air cylinder goes into the block. Anyone know the o ring size for the 2 rings in the pic I've attached.  I put some new o rings but not exactly the right fit and none of my rings seem to match.

[TroyHammer]

Those o'rings won't cause a leak. They only help make sure all air during the firing cycle goes through the transfer port. Fill the tube while not installed in the breech then see if it's coming from the exhaust port in the valve or where the tube and valve meet.

[TroyHammer]

It's actually probably coming from the brass fitting on the top of the valve.  Give it a little snug turn.

[Ed24]

Troy,
Thanks for the info. I'll try tomorrow when I get out of work and will let you know. Do you know the size of the o rings anyways since I need to get the right size on there.

[TroyHammer]

Troy,
Thanks for the info. I'll try tomorrow when I get out of work and will let you know. Do you know the size of the o rings anyways since I need to get the right size on there.

2mmx16mm for the outer valve orings.

[Ed24]

Troy,
Thanks again for your help!

[Ed24]

Ok, I removed the air cylinder and started to air up and air was coming out of the transfer port hole.  This all started when I installed a huma reg which I have now removed. I took a pic of the valve and spring assembly to see if maybe I'm missing something. Should there be a o ring at the base of the valve stem???

[TroyHammer]

You're not missing anything.  Gun does need to be cocked when filing from empty and needs to be from a bottle to build pressure fast enough to seal most of the time. The Puncher breaker/mega reg does not fit an NP-03 so the fact it fit the tube means it should be the correct reg. Air coming from the transfer port means that the poppet isn't sealing.  Could be damaged or have some debris in there.

[Ed24]

It's a huma reg for a np03. I removed because it was pretty consistent before and all I did was lower the shot count.  If you could contact me would like to see about sending to you. My email is edlfern24@gmail.com. Thanks Troy for your help.