FX Help with M3 bottle please

Hi guys, need some advice on a used gun I bought recently.
Please keep in mind that I am in Argentina so parts are very hard to come by here. I recently bought a used Impact M3, the person I bought if from had a 1st reg bypass made, it’s not the one sold by Saber Tactical but it seems to be a copy of it. He also had a brass insert made and replaced the 1st reg pressure gauge with it. The system works fine, the gun shoots great but the problem I ran into is that whenever I unscrew the bottle, all the air leaks out of the bottle, it doesn’t cut off the air loss like my other guns. Once screwed I have to fill the gun from 0 every time!!
I have noticed a part called “fx air bottle end or bottle valve”, I would assume that is the part that I need, would that be right?
My intention is to buy a proper Saber Tactical 1st reg bypass over the next few months along with this bottle valve, my question is: are they compatible? Will they work fine together?
Thanks a lot guys,

Saludos,

Lucas
 
I meant Vtmx sorry!! In fact, thanks to all of you, haha!!
Once you get the valve out, you’ll need a 14mm to remove the brass nut and do some inspecting.

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