Tuning Air Venturi avenger lower tube leak

Went to fill it up today. Noticed a leak from the lower tube at the “cap”. Not sure if the cap is loose or if it is a fixed part of the gun. Any ideas would be great.

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You'll need to evacuate all the pressure from the gun before you can remove the cap. Once the load is off the threads, it will be much easier to remove. But more importantly, safe to remove.
That’s the easy part. I actually have 2 leaks from the lower tube. Hoping some new o rings will fix it.

Anyone know where to get the correct O rings?
 
Went to fill it up today. Noticed a leak from the lower tube at the “cap”. Not sure if the cap is loose or if it is a fixed part of the gun. Any ideas would be great.

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I have the same problem. The cap is super tight. Did you have to use heat to get the cap off? Was Loctite used when the factory assembled the gun?
 
I have the same problem. The cap is super tight. Did you have to use heat to get the cap off? Was Loctite used when the factory assembled the gun?
I know this thread is old, but many like me have 5 year old avengers prime to start leaking. The plug where the fill valve is takes a 20 mm wrench. The air tube end caps take 24 mm. All are difficult to remove. Yes, they had thread lock. Had to put in vice (use rubber or jaw covers) and use heat.