Connecting the Huben 350 psi compressor to Hill Dryer filter.

[Avok]

Hey Everyone!

I have Huben GK1 and I also bought the Huben compressor here: https://www.hubenairguns.shop/products/compressor
I am having difficulties with the drying filter: https://www.hubenairguns.shop/products/hill-inline-drying-filter

I cannot install it on the compressor. The compressor has a male output for its hose quick disconnect female. The drying filter hose supplied has only threading at the ends. I was able to disassemble one end of the filter hose, one part I installed in place of the compressor quick connector and screwed in the other part from the filter hose. Then I connected the other end to the silver cap. The problem I still have is with the golden cap. I removed the quick disconnect of the original compressor fill whip and tried to screw the hose in to the golden cap. But it doesn't fit! The tread is very slightly larger, approximately 0.5 mm than the one of the original filter hose connectors. I wonder if it would seal properly, even if was able to screw it in.

Please, check the pictures. You can see:
1. The original quick disconnect that I removed from the compressor and some golden compressor accessory that doesn't fit anywhere.
2. The compressor with the filter hose installed.
3. The filter hose connected to the filter
4. The original compressor fill whip with both ends quick disconnect and a golden filter at one end.
5. The golden filter removed
6. Trying to fit the original compressor hose to the Hill filter. Doesn't fit.

I am relatively new to the space and it all very confusing to me still. Any help is much appreciated!

 

[markhooper]

looks to me like the fittings are not the same size and if so they definitely won't seal..
I'd recommend seeing if you can get quick disconnects for the filter.. might make it easier to service too.. plus I wouldn't want it hard attached off the compressor as it could get bumped and definitely not on the end of the hose where you fill the gun..
it's a shame that it's not installed in some area in the compressor housing and yet easy to service.. that's one thing I really like about my Omega trail charger.. it's all a simple package..
hopefully someone else who has you compressor and filter assembly can direct you to the right parts to make it work..
but remember if they don't go together correctly they will not seal.. you can even have identical threads and be missing a o ring or sealing washer and it will not work..
mark

 

[Avok]

looks to me like the fittings are not the same size and if so they definitely won't seal..
I'd recommend seeing if you can get quick disconnects for the filter.. might make it easier to service too.. plus I wouldn't want it hard attached off the compressor as it could get bumped and definitely not on the end of the hose where you fill the gun..
it's a shame that it's not installed in some area in the compressor housing and yet easy to service.. that's one thing I really like about my Omega trail charger.. it's all a simple package..
hopefully someone else who has you compressor and filter assembly can direct you to the right parts to make it work..
but remember if they don't go together correctly they will not seal.. you can even have identical threads and be missing a o ring or sealing washer and it will not work..
mark

Yes, its a shame, I bought the compressor with the filter as an option from Huben. They came together. I was very surprised they don't fit. The manual of the filter only talks about the Hill EC-3000 · Compressor that it seems to be designed for. Its even more interesting that the compressor can make up to 315 psi, but the filter is 300 max. I guess even at 315 the filter wouldn't explode, but ... not ideal. I messaged Huben, but they take ages to respond these days.

 

[markhooper]

Yes, its a shame, I bought the compressor with the filter as an option from Huben. They came together. I was very surprised they don't fit. The manual of the filter only talks about the Hill EC-3000 · Compressor that it seems to be designed for. Its even more interesting that the compressor can make up to 315 psi, but the filter is 300 max. I guess even at 315 the filter wouldn't explode, but ... not ideal. I messaged Huben, but they take ages to respond these days.

that's a shame.. apparently they sent you a filter for a different compressor..
have you checked the manual to see if the compressor already has a filter? if it does you could use it until you get the parts for the secondary filter..
I personally only use the one in my Omega trail charger and it's been good for 8 years now..
hopefully you can get a resolution soon so you can play with the top pistol on my wishlist..
however there is likely going to be more pistols coming out before I can save up enough money.. even though you are having this problem consider yourself lucky that you actually have the pistol..
the closest thing I have is a umarex notos pistol and at 22" long it's not a pistol.. but hopefully this week it will be shortened in my machine shop.. it's just I haven't had time yet..
it's definitely going down to 16" but if I can manage the threads on the air tube it will be 12"..
at 12" that's a large pistol..
I sure wish there were more options for a compact pistol..
yours is the top.. there's the evinix viper but I have read a lot of issues with it..
and there's the attaman ap16 compact that I keep looking for a used one because can't get new ones now..
also there's the tequila gun..
think that about covers all the ones available right now..
yours seems like the best option for the money..
I really hope someone can help you, because I know how it is if you get a new toy but can't play with it..
Mark

 

[Avok]

Thanks @markhooper! The compressor has one small cotton filter, the golden one shown in the pics. I would rather use this kind of filter for the Huben pump that I also got (https://www.hubenairguns.shop/collections/pcp-fill/products/hundpump-for-pcp-airguns-350bar-5000-psi). The pump is supposed to fill the GK1 to 350 psi for a few more high power shots when hunting. But it has no water filter whatsoever, only a mechanical one. I have yet to see a water filter solution for this pump.

I wonder if its worth to risk it and pump the gun manually from current 200 psi to 350. Or use the compressor small filter and do the same, but only to the max of 315.

I really don't understand how much problem is water in hand pumps. All this talk about keeping it lower than the gun is fine, but if there are no silica beads somwhere along the way, maybe not liquid, but moist air is going to get in to the gun. Not sure how much moisture a gun is supposed to handle.

 

[markhooper]

ok well I think mine is just a moisture trap, it's cleared each time by the bleed knob .. so on my compressor it goes to the moisture trap and bleed screw is on the bottom and the flex hose is out the top of the compressor..
I'm not sure where you live but I have always kept it in the garage and so about half the time I had it we lived in logsden Oregon on the edge of a rain forest.. couldn't sleep with the window just barely open like I grew up because it was so humid during the winter that the carpet would feel damp.. and I have had it along with the American tactical liberty nova 22 for 8 years now and I'm just starting to have trouble.. I live in Rogue River Oregon and it's 4x drier here.. the American tactical is starting to leak down to regulator pressure and fairly certain that it's a o ring.. never seen any signs of water except for when I bleed off from filling up back at the old place where it was more damp..
personally I think the regular water trap is good enough.. if you have silicon beads dryer you will have to bake them dry in the oven every so often.. if you have humidity..
Mark

 

[markhooper]

hopefully you can see the hose at the bottom.. it's where the bleed is and where water used to come out in humidity.. on the left side is the silver fill hose..
personally if you don't have over 50% humidity in the house or garage I don't see a problem with just a moisture trap..
guess once I get the o ring kit from Captain O ring and rebuild next year.. I will see if there's any sign of moisture inside the gun..
but honestly I don't think so.. I used to paint with 90% humidity outside and inside the shop was my compressor 2 stage and no drier.. I was painting inside the paint booth usually a whole day except for lunch and I never once had trouble with moisture in the air messing up the paint..
while it's best to take precautions with filling the air gun I doubt you will see any moisture if you hand pump in the house where it's heated..
sometimes we all can get carried away with things.. I think where you would have trouble is filling outside in high humidity and more so even with the compressor..
at the previous place in high humidity I always ran the compressor for the air guns for at least a minute after opening the bleed screw to complete the drainage of all condensed water..
Mark

 

[WorriedMan]

Avok,
I'm sorry to hear of your troubles, hard to understand Huben selling these two products together when they aren't compatible. Looking at the Huben compressor, it looks similar to no-name Chinese compressors that companies purchase to re-brand as their own. We know the Hill filter is made in England with most likely fittings unique to Hill. Chinese filters go best with Chinese compressors, Hill filters go best with Hill compressors. Recommend a Chinese molecular sieve filter as pictured, around $60 on eBay, comes with 8mm quick-disconnects, just like your Huben compressor, and a burst disc for protection. Of course, I could be all wrong about the Huben compressor being made in China, but sure looks similar to ones I've seen. WM

 

[Avok]

Ok, first a short lesson about threads:

The standard foster (quick disconnect) males and females are 1/8 inch NPT (US / Canadian)
The British standard ones are 1/8-Inch BSPP connections

NPT vs BSP: Differences, Chart, NPS, BSPT - Plumbing Sniper

I was writing an article about the different types of thread sealants and I remembered that all threads are not created equal. Pipe thread forms in the United States is different to that of the United Kingdom. The two main types of pipe thread styles are National Pipe Thread (NPT) and British...

plumbingsniper.com

National Pipe Taper: NPT threads are tapered.
National Pipe Straight: NPS threads are straight/parallel.
British Standard Pipe Parallel: BSP threads are commonly known as BSPP.The second “P” simply denotes that the threads are parallel,
British Standard Pipe Tapered: the same way the “T” in BSPT denotes that the threads are tapered.

Just to confuse you more NPT (National Pipe Thread) and BSPT (British Standard Pipe Taper) are not compatible. The reason is that NPT and BSPT threads have different thread designs. NPT threads are tapered and have a 60-degree angle, while BSPT threads are also tapered but have a 55-degree angle. Same goes for NPS and BSPP.

So none of those are compatible with each other, but sometimes depending on the case and tolerances you could force one into the other. With unpredictable results. It would wear or damage the threading or could leak. Got to love the all those various standards and how clearly they are marked on web sites.

So, as Hill uses (of course) British BSPP and the Chinese origin compressors use US standard NPT, to use this compressor with the filter I ordered from Huma Air:

1 Foster Male to G1/8" BSP Female Adaptor
1 Foster Female Quick Connect Coupler to G1/8BSP Male Treads
2 Rubber Steel Washer G1/8 (Bonded Seal) (one for reserve)

 

[WorriedMan]

Ok, first a short lesson about threads:

The standard foster (quick disconnect) males and females are 1/8 inch NPT (US / Canadian)
The British standard ones are 1/8-Inch BSPP connections

NPT vs BSP: Differences, Chart, NPS, BSPT - Plumbing Sniper

I was writing an article about the different types of thread sealants and I remembered that all threads are not created equal. Pipe thread forms in the United States is different to that of the United Kingdom. The two main types of pipe thread styles are National Pipe Thread (NPT) and British...

plumbingsniper.com

National Pipe Taper: NPT threads are tapered.
National Pipe Straight: NPS threads are straight/parallel.
British Standard Pipe Parallel: BSP threads are commonly known as BSPP.The second “P” simply denotes that the threads are parallel,
British Standard Pipe Tapered: the same way the “T” in BSPT denotes that the threads are tapered.

Just to confuse you more NPT (National Pipe Thread) and BSPT (British Standard Pipe Taper) are not compatible. The reason is that NPT and BSPT threads have different thread designs. NPT threads are tapered and have a 60-degree angle, while BSPT threads are also tapered but have a 55-degree angle. Same goes for NPS and BSPP.

So none of those are compatible with each other, but sometimes depending on the case and tolerances you could force one into the other. With unpredictable results. It would wear or damage the threading or could leak. Got to love the all those various standards and how clearly they are marked on web sites.

So, as Hill uses (of course) British BSPP and the Chinese origin compressors use US standard NPT, to use this compressor with the filter I ordered from Huma Air:

1 Foster Male to G1/8" BSP Female Adaptor
1 Foster Female Quick Connect Coupler to G1/8BSP Male Treads
2 Rubber Steel Washer G1/8 (Bonded Seal) (one for reserve)

Seems you're on top of this, that Huben sells these two products together, with such incompatibility, still has me scratching my head. Have to admit I lack the courage to "force" parts to fit when dealing with high-pressure air, prefer waiting for correct fitting parts, even if tempted by brand new airgun. Wishing you the best of success and happiness when all things finally come together. WM

 

[AlanMcD]

To add to what Avok posted, the Chinese do a lot of foster fittings with metric M10x1 threads. These are parallel and require an o-ring, a plastic washer, or thread tape to seal (most are designed using the plastic washer).

And that is just to get the darn things on the line or whatever. After that, there is no real standard on the foster fittings themselves. Some fit together better than others, and some won't work with others. Drives us nuts . . .

 

[Avok]

To add to what Avok posted, the Chinese do a lot of foster fittings with metric M10x1 threads. These are parallel and require an o-ring, a plastic washer, or thread tape to seal (most are designed using the plastic washer).

And that is just to get the darn things on the line or whatever. After that, there is no real standard on the foster fittings themselves. Some fit together better than others, and some won't work with others. Drives us nuts . . .

Yeah, my compressor threads could actually be metric. its difficult to check. It doesn't matter for the adapters I am getting though. I also saw an article saying the quick foster fittings have no standard, some are misaligned to such an extent, they can violently disconnect under pressure and whiplash your brains out. I would recommend pressure testing your setup before first use. Or at least fill your gun from a distance a few times, with a compressor that can auto disengage.

 

[Pfddi]

@Avok Just an FYI - You didn't buy that compressor from Huben! That is not Huben's website. Huben does not sell direct. That's the Spanish reseller!

Here is Huben's website: https://www.hubenairguns.com/

 

[Avok]

Hey guys, I managed to fit everything that I bought from Huma Air to the Hill Drying filter but their foster female part (
Foster Female Quick Connect Coupler to G1/8BSP Male Treads) does not fit the Huben PCP compressor male foster coupler. Its too tight / smaller diameter, it jams before it can go in enough to lock.

The Huma Air part is here https://huma-air.com/foster-female-quick-connect-coupler-to-g1-8bsp-male-treads/
Others I found:
1. https://www.airgunseurope.com/foster-quick-connector-female.html
2. https://www.edgun.shop/products/foster-female-quick-connect-coupler?variant=39787563221026
3. https://www.sekhmetonline.com/products/female-quick-connect-coupler-to-g1-8-bsp-male-foster
4. https://www.amazon.com/Air-Venturi-Foster-Female-Quick-Disconnect/dp/B00F0NSJKU

Any idea which one will fit or how do I measure my male coupler and ask the shop to verify?