Need assistance with stuck foster fitting

[Sanctify7]

S7, no worries! You'll be glad you ordered it. Can you show a pic or pics of your air hose setup? I don't see a bleed valve, or do you bleed it at the compressor? I'm curious about that "block" assembly with the brass burst disc nut.

Hi, Gerry52.
I just saw this full post. Here are two pictures. Heavyopp clarified that the GX bleeds at the compressor. You can see the valve knob clearly. My one need now is to get a coupling that will (1) fit properly to the Crown nipple and (2) screw into the GX block. Thank you. S7

 

[Sanctify7]

The FX supplied coupler will seal on the gx aluminum block it’s just that the Chinese threads suck.

the aluminum will gall to the steel threads while tightening. Use some lube, preferably not petroleum based on the threads. That should help with getting the fitting seated on the sealing washers.

To Heavyopp and Glem.Chally: I could try this. But I will tell you, I was using serious force and two pliers. I made gouges in the block and both the FX and AV fittings. And I hate doing that. I figured the Chinese threads were the culprit. Are you sure that the couple will seal on the aluminum block, Heavyopp? I twisted with might and main. I don't want to exacerbate things, in particular, destroy the threads in the block. Will Crosman Silicone Chamber Oil work? Thanks. S7

 

[Heavyopp]

There may be a delrin seal in the hole of the block — its a white plastic “washer“ in the threaded hole. That is a seal that may work.

have you tried to pressurize your setup with the supplied foster”plug”.

you cannot use both seals, either use the metal/ rubber washer as a seal or the delrin insert as a seal.

look in the hole under the coupler. What do you see?

 

[markT]

I assume the left brass piece is a bleeder valve / right is pressure gauge / top is a coupler? If that is a coupler then is different looking from what I have... The AL manifold ( block) should be threaded BSP but with China you just don't know...
I bought an extended coupler from Air Tanks Joe Bron.. I told him I needed 1/8 Female BSPP threads... They only stock npt threads.. Had to return and get refund...

 

[Heavyopp]

Left brass piece is the burst disk, and top is coupler with the test plug installed

looking at that pic I’m betting the delrin seal is down there, under the coupler. Also I do not see the sealing washer that I thought the OP was trying to use.

 

[Gerry52]

That "block" assembly must make it a bit clumsy to connect when filling a gun. Surprised the mfg didn't put it closer to the compressor & NOT at the end of the fill hose. Technically the system would work without that block but I'm assuming there's no burst disc at/on the compressor itself. An awkward design imho. The extended female foster is bsp, hope it fits into that block correctly. You might have to use a dowty seal/bonded washer between block & extended foster IF there's no Delrin seal in there.

 

[douger]

i add a little hose to the block first off thats terrible clumbsy then get a extended fill sourse from trenier air guns he sells hose and lots fittings

 

[Sanctify7]

There may be a delrin seal in the hole of the block — its a white plastic “washer“ in the threaded hole. That is a seal that may work.

have you tried to pressurize your setup with the supplied foster”plug”.

you cannot use both seals, either use the metal/ rubber washer as a seal or the delrin insert as a seal.

look in the hole under the coupler. What do you see?

Greetings. I am not sure where to look for this "delrin seal."

i add a little hose to the block first off thats terrible clumbsy then get a extended fill sourse from trenier air guns he sells hose and lots fittings

Thank you for that information. It is terribly clumsy. S7

 

[Sanctify7]

Before I mover further on this, I contacted the seller last night and got a response today. That's quick. Here's what the seller (ANKUL) said, without changing anything, including spelling:

"Hello
our compressor comes with a 8mm quick connector. This can fit almost all pcp. but you still should make clear if 8mm quick connector fits your airgun before order. we have stated this clealry on amazon page.
As a result, i suggest you look for a fitting connector to our compressor and your gun.>if you can not, you can return for a refund .
Thanks"

So, I have two questions for you very helpful guys, and one comment:
1. I have scoured the Amazon page that I bought this from. I cannot see anything mentioning an "8mm quick connector." Here's the page: https://smile.amazon.com/dp/B07XYRS15R?psc=1&ref=ppx_yo2ov_dt_b_product_details
2. Is an 8mm connector what I need? Is it standard?
3. There's are two O-rings inside the female end (coupler) of this rig which are inserted in two circular recesses in the brass. They were misshapen and not in their proper place from the beginning. (I am sorry if I didn't mention this originally.) I tried to take pictures but it is hard to see this situation clearly. But you can see that the hole in the middle on the bottom does not have even spacing around it due to the protruding O-ring/rings.

If anyone confirms that the 8mm Quick Connector was not mentioned on the Amazon page, I will then respond to ANKUL.
Thank you again so very, very much for all this help. S7

 

[Sanctify7]

Triple check that there is no pressure. You can pull the action up out of the stock to get hands on the fitting if need be. My Crown came with a female foster fitting which is not long, but long enough to use.

And I did triple check. Thanks.

 

[Sanctify7]

View attachment 299529
I assume the left brass piece is a bleeder valve / right is pressure gauge / top is a coupler? If that is a coupler then is different looking from what I have... The AL manifold ( block) should be threaded BSP but with China you just don't know...
I bought an extended coupler from Air Tanks Joe Bron.. I told him I needed 1/8 Female BSPP threads... They only stock npt threads.. Had to return and get refund...

markT, I believe it is. It has a hole in the center. Correct on the other two. I guess the manifold is not threaded BSP. Again, when I removed the coupler, my FX and Air Venturi couplers would not screw into the block fully, so I could not use them. They screwed in about two-thirds of the way and then hit a near wall. I know of Joe Brancato and copy on your miss with him. I am learning a lot through you guys. I am still working on putting it all together in a usable way. Thank you once again. S7

 

[Sanctify7]

To Heavyopp and Glem.Chally: I could try this. But I will tell you, I was using serious force and two pliers. I made gouges in the block and both the FX and AV fittings. And I hate doing that. I figured the Chinese threads were the culprit. Are you sure that the coupler will seal on the aluminum block, Heavyopp? I twisted with might and main. I don't want to exacerbate things, in particular, destroy the threads in the block. Will Crosman Silicone Chamber Oil work? Thanks. S7

View attachment 299466

Also, I am worried to do this. I am in contact now with ANKUL, the seller, and will wait to hear from him. I'll bear it in mind. Thank you. S7

 

[Sanctify7]

Update: The seller did indeed mention an 8mm connector. I missed it and my wife found it. I am still waiting for him to respond to my mentioning that O-rings inside the coupling were damaged/out of place. BTW, I took the coupling off but could not access the rings to attempt a fix. Thank you. S7

 

[Glem.Chally]

That "block" assembly must make it a bit clumsy to connect when filling a gun. Surprised the mfg didn't put it closer to the compressor & NOT at the end of the fill hose. Technically the system would work without that block but I'm assuming there's no burst disc at/on the compressor itself. An awkward design imho. The extended female foster is bsp, hope it fits into that block correctly. You might have to use a dowty seal/bonded washer between block & extended foster IF there's no Delrin seal in there.

This is the "YH killer"

 

[Heavyopp]

Throw that chinese coupler out. Thread a good extended coupler in place of the chinese coupler.

The delrin seal should be under the chinese coupler in the aluminum block. Take the coupler out of the block and look in the hole in the block. Is the hole all aluminum? Can you see what looks like a white plastic ring in the hole? That white plastic ring is the delrin seal. I took mine out and opted to use the “dowty?” bonded sealing washer.

Yes it’s hard to thread the new coupler in. Needs lube on threads. Chinese threads suck but it worked for me multiple times. I also changed the gauge to a wika, had a hard time threading that too. I used a moly grease on the threads. Silicone grease should be fine. Candle wax would work, even soap would be better than trying to do it dry.

I wouldn’t return the whole compressor for a coupler issue. Lots of ways to work this out.

 

[Heavyopp]

This is the "YH killer"

Yh killer was definitely the wrong choice of words for target forge. Admittedly the OP isn’t very handy. He would struggle with a YH too.

Just needs a little help.

 

[Sanctify7]

Throw that chinese coupler out. Thread a good extended coupler in place of the chinese coupler.

The delrin seal should be under the chinese coupler in the aluminum block. Take the coupler out of the block and look in the hole in the block. Is the hole all aluminum? Can you see what looks like a white plastic ring in the hole? That white plastic ring is the delrin seal. I took mine out and opted to use the “dowty?” bonded sealing washer.

Yes it’s hard to thread the new coupler in. Needs lube on threads. Chinese threads suck but it worked for me multiple times. I also changed the gauge to a wika, had a hard time threading that too. I used a moly grease on the threads. Silicone grease should be fine. Candle wax would work, even soap would be better than trying to do it dry.

I wouldn’t return the whole compressor for a coupler issue. Lots of ways to work this out.

Thanks for hanging in there with this for me, Heavyopp. I have taken the coupler out and looked in the block yesterday. My (mechanic) brother was trying to help me over the phone. He thought something inside may have been impeding the FX coupling. However, I poked the white something or other (delrin seal?) with a toothpick to see if it was hard or soft, and it was soft, so I figured it could not be blocking things. Was I incorrect?
Two questions, and some comments. First, the questions: (1) Would the Crosman Silicone Chamber Oil qualify as a lubricant? I have a tube. (2) Will I ruin the FX coupler trying to do this?
Here's the comments. I just now measured the threaded area on the male end of the couplings: the factory one is 2.4mm and the FX one is 2.6mm. Hence, the difficulty of screwing the FX one into the block.
Also, the FX threaded area is shorter than the threaded length of the factory coupling. I took the best pictures I could to show you (1) what's inside the aluminum block and (2) the threaded length discrepancy. The FX coupling is the longer one on the left of the third picture.
For a guy that cannot get anywhere yet, I am learning things that I would not have paid attention to.
From here, I agree with keeping the compressor if I can get it going. I suspect the unit itself is decent.
I would love to swap the gauge, too, but one thing at a time. What say ye? Thanks. S7

 

[markT]

If you can find a nipple that will fit the supplied coupler then maybe you can buy a short "whip" hose and have one end with a nipple that fits your supplied coupler and the other with a coupler ( Foster profile) that will fit the nipple on your FX Crown..
Not sure what the white composite material is inside AL block.

 

[Sanctify7]

If you can find a nipple that will fit the supplied coupler then maybe you can buy a short "whip" hose and have one end with a nipple that fits your supplied coupler and the other with a coupler ( Foster profile) that will fit the nipple on your FX Crown..
Not sure what the white composite material is inside AL block.

Copy. I believe it is a moisture filter. Thanks. S7

 

[Gerry52]

Here's the easiest fix I can think of. Put the original foster female quick connect back in the block. Go on Ebay, search "pcp fill whip" & buy the one with a MALE FOSTER adapter on one end & regular female qc on the other. Take off female QC & replace it with this (link). Connect Male end of whip at aluminum block & fill gun with new extended female. That should work (might have to use dowty seal with new extended female)

Paintball PCP 1/8" BSPP Female Thread Coupler HPA CO2 Air Tank Refill Connector Quick Disconnect Quick Release Adapter Fitting https://a.co/d/693raZC

Here's the link for the fill whip:

G7 paint tank fill whip 4500psi line 34" scuba fill PCP 1/8" Quick Release 10510 | eBay

Work with ALL Steel and Aluminum paintball HPA Tanks, Scuba fill station, Remote line. In-Flight refill HPA paintball tank. Double check and Secure all QD connection prior refill High Pressure Air. TWO Quick release Disconnect for easy removal.

www.ebay.com