Other Quick release coupling... Standard?

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doodloo

doodloo

Member
Sep 22, 2024
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Ljubljana, Slovenia
Hello,

First I would like to point out that I checked the forum, but I haven't found really conclusive answers.

I own an Ataman AP16. I fill it with a Hills mk5 and it works great. I was using the "threaded" probe and I had no leaks.
Last week, I received my new Gk1 v3 and it comes with a quick disconnect coupling. My Hills mk5 doesn't come with this, so I ordered one.

My AP16 came with a quick coupling male probe, and it seems to seal fine with the Hills female quick disconnect.
However, it doesn't seem to work with the Gk1 probe.

Let me show you - I attached pictures.
Somehow I feel like the "retaining" lip of the Gk1 (steel) is shorter than the Ap16 (brass), and so with the Gk1 probe there's a bit of "give" and it doesn't seal. If I apply pressure on the Gk1 probe it seems to seal better, but I wouldn't bet 300 bar on this :)


Another thing - notice the green o-rings in the female fitting - before and after coupling it with either probes - the o-rings seem to be moving out of place, and I am wondering if it's missing a smaller o-ring at the very back to keep the stack "in compression".

I'm a bit confused, and I don't seem to find a standard or norm to Google for. Dimensions seem to be arbitrary - is there any support material I could use to order the right parts? Ideally, I'd like to be able to swap probes without screwing / unscrewing.

Thanks!

The "retaining lips" seem to be of different size... So the Gk1 doesn't go as far in the female fitting maybe?
1000017428.jpg



The fitting before attaching anything to it. Notice the green o-rings are correctly placed.
1000017429.jpg


The fitting after attaching either the Gk1 probe or the Ap16 probe. Notice how the o-rings seem to have moved / twisted...

1000017430.jpg


All parts, side by side, maybe you can spot that I'm doing something very obviously silly?

1000017426.jpg
 
There is a standard. It's the foster standard. The chinese copies are metric instead of inch and have 2 orings instead of 1. Foster males will fit chinese females. Chinese males will only sometimes fit Foster females. At least you have a female with 6 balls. I've seen them with as few as 3 though 4 and 5 are more common. 6 is thebcorrect number. Yes yhe huben probe will seal if you press it in and apply pressure. The pressure seats the oring and seals. Yes once it seals it will hold 300 bar. There are other writeups on the quick disconnect fitting lack of standardization on this forum.
 
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Thanks both for your help!

@Sergey1972 I'm pretty sure neither of my probes or fitting are chinese - ordered from reputable shops, or provided "in the box of the airguns"... Are you saying that although the GK1 doesn't **seem** to seal, once there's pressure it will? So far I've only tried blowing air in it with my mouth as I'm not too keen on trying with real pressure unless I know it seals...

@PasadenaMike I've seen this link before, but wasn't sure whether it was really actual / relevant. I will read again.
 
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doodloo said:
Hello,

First I would like to point out that I checked the forum, but I haven't found really conclusive answers.

I own an Ataman AP16. I fill it with a Hills mk5 and it works great. I was using the "threaded" probe and I had no leaks.
Last week, I received my new Gk1 v3 and it comes with a quick disconnect coupling. My Hills mk5 doesn't come with this, so I ordered one.

My AP16 came with a quick coupling male probe, and it seems to seal fine with the Hills female quick disconnect.
However, it doesn't seem to work with the Gk1 probe.

Let me show you - I attached pictures.
Somehow I feel like the "retaining" lip of the Gk1 (steel) is shorter than the Ap16 (brass), and so with the Gk1 probe there's a bit of "give" and it doesn't seal. If I apply pressure on the Gk1 probe it seems to seal better, but I wouldn't bet 300 bar on this :)


Another thing - notice the green o-rings in the female fitting - before and after coupling it with either probes - the o-rings seem to be moving out of place, and I am wondering if it's missing a smaller o-ring at the very back to keep the stack "in compression".

I'm a bit confused, and I don't seem to find a standard or norm to Google for. Dimensions seem to be arbitrary - is there any support material I could use to order the right parts? Ideally, I'd like to be able to swap probes without screwing / unscrewing.

Thanks!

The "retaining lips" seem to be of different size... So the Gk1 doesn't go as far in the female fitting maybe?
View attachment 512764


The fitting before attaching anything to it. Notice the green o-rings are correctly placed.
View attachment 512765

The fitting after attaching either the Gk1 probe or the Ap16 probe. Notice how the o-rings seem to have moved / twisted...

View attachment 512766

All parts, side by side, maybe you can spot that I'm doing something very obviously silly?


View attachment 512767
Click to expand...

I snapped a quick pick of these two brand new fill probes - would the edgun version fit the Gk1 v3 or Ataman? If so PM me and you might have a fix.

IMG_7283.jpeg
 
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Your observations are correct. There are no observed standards, unfortunately. It is best to use fittings from the same source. Also, pay attention to the diameter of the slip sleeve. Some are so large as to interfere with the ring sliding over the retention balls, which leads into an explosive release of the fitting when under pressure. This is a common fault on some FX rifles.
 
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cavedweller said:
I snapped a quick pick of these two brand new fill probes - would the edgun version fit the Gk1 v3 or Ataman? If so PM me and you might have a fix.

View attachment 512789
Click to expand...
This is really awesome from you to offer.
Unfortunately I'm not allowed to DM yet. And I might have found a way to fix the problem.

If it doesn't work longer term, I might try one of your fill probes!
 
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@steve-l / @Mike_Lenardon thanks guys, this is awesome community support right here.

So I studied the problem a bit more.
As you can see on the original picture, the green o-rings seem to get pushed inside the female fitting instead of getting around the seal part of the male probes.

Ok.

I thought, preventing them from moving back in the female fitting might work.
So I took a smaller o-ring from the Gk1 maintenance pack, and slid it behind the green o-rings. My logic was that if it's slightly smaller, it will 1) prevent the twisting of the other o-rings while 2) allowing for a bit of compression.
When I inserted the probe in the fitting, I could immediately feel the difference. This little bit if resistance and then going in was characteristic of the green o-rings "mounting" on the probe. This wasn't the case before.

It seems that it worked - I was able to pump the Gk1 to circa 250 bar.

This leads me to believe that either:
- The female fitting is flawed. Maybe missing a piece. Unlikely...
- Or it it designed for slightly smaller diameter of male probe - that's why the o-rings inside won't engage around the male probe and instead are being pushed.

To me it doesn't sound like a final solution. The fact that the green o-rings are now in fair compression between the wall of the female fitting and the outside of the male probe seems like it just begs to wear out too fast...
Ill be ordering different female fittings and keep you posted :)

Thanks again for your help!

---

To help you fix yours...

This is the original fitting, after trying to insert a probe. Notice how o-rings are pushed back and twisted. No way it can seal, as I would assume they have to "mount" around the male probe...
IMG_20241114_084153.jpg

Here, you can see how I "slid" an additional o-ring. The goal isn't for this o-ring to seal anything but instead to act as a spacer to keep the green o-rings from being pushed, and instead allow them to get caught around the male probe.

IMG_20241114_163827.jpg
 
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Vana2 said:
Curious. Which FX rifles Steve?

I have a Royale, Impact, Crown, Panthera and DRS. Never had one release while filling.

Cheers!
Click to expand...
Those with wooden stocks, like my Crown. the male fill fitting is a bit recessed in the fore end and can be difficult to mount a female whip. If you were to buy an extended fitting to solve that issue, the sliding sleeve is slightly larger in diameter which interferes with the smaller cutout in the wood stock just enough to prevent the sleeve completely falling over the retention balls in the female fitting.
 
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steve-l said:
Those with wooden stocks, like my Crown. the male fill fitting is a bit recessed in the fore end and can be difficult to mount a female whip. If you were to buy an extended fitting to solve that issue, the sliding sleeve is slightly larger in diameter which interferes with the smaller cutout in the wood stock just enough to prevent the sleeve completely falling over the retention balls in the female fitting.
Click to expand...

Yeah, the male fitting is a bit recessed in the stock, that is why FX supplied an extended length female foster fitting with my Crown. Been using that for several years with no problems.
 
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