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Omersub Gauge to Seac adaptor

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.

grantl

Well-Known Member
Dec 5, 2005
701
319
153
Does anyone know where I can get one of these in the UK?
I'm going to be getting a dry barrel kit on my Caccia 115 but want to know what pressure I've been using it at before it is depressurised.
I've got an Omer gauge and the only place I can find an adaptor is from the US.

There must be a simpler option surely?

Can anyone tell me what the respective thread sizes are and then I should be able to find one in the UK from a gauge supplier I guess?
 

I got one of those adapters for a Seac Hunter, but I am not impressed at all. I think I'll actually email Omer and talk to them about it. The thing is, the little pin that comes out of the adapter to pop open the valve is not long enough and it doesn't stay put. I have to pull it out with pliers before each use. And I mean each use. So, once I have done one measurement and unscrewed the gauge to eg. put more air in the gun, I have to pull the pin before taking another measurement.
Maybe mine is a lemon, I don't know. I got around it by cutting a small piece of an o-ring and dropping it on top of the valve to "extend" the reach of the pin. But I have to take that little rubber piece out before pumping again. It's a hassle to say the least.

I got it from a shop in Italy (not their fault, that the product is not great):
http://shop.deepbluesub.com

I can't remember the thread size for the Seac but I think perhaps Tomi or Marko can help. I think perhaps Marko can even make you a gauge (adapter)? LG-sub also has a gauge I think, though not cheap.
 
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Thread dimensions for Mares and Seac Asso and Mamba gun are M14x1 (1 mm pitch), the easiest way is to compare pressure gauge adapter with pump, they are same dimensions, maybe for Seac Caccia is something different , I mean maybe it is not same valve design as on seac Asso gun.

Here are my 2 videos , first is good trick in case that air escapes from gun, probably it happens if O-ring is not from appropriate material , it must be "hard" to withstand air pressure .

[ame="https://www.youtube.com/watch?v=5OKuT12VztY"]10-6-2 NBR O-ring in pneumatic speargun - YouTube[/ame]

[ame="https://www.youtube.com/watch?v=z9GG_-SAqsE"]Manometar sa adapterom - YouTube[/ame]
 
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The gauges are standard - used in many industries. The adapter is not. Mainly because it needs a pin to open the ball valve on the gun. (Also, guess the standard for the gauges and hydraulics are still in inches whereas our guns are in metric?)

A few people make the adapters them themselves, but you need a lathe and the skills. Maybe Marko above could make one for you. I don't think the Omer adapters would work either as their gauge itself already has a pin and non-standard thread on it. Well, non-standard probably to the gauge you have found cheaply that is.

There are a few standard threads for these gauges, so if you have an adapter made - then just make sure you have it made for the right gauge thread.

The alternative is buying a ready-made Omer or LG Sub but especially the latter is expensive. Really well made though. My experience with the Omer one is so-so, but others have not complained.

I'd drop Marko a line and ask if he can make one for you.

D.
 
istriker 22, this is a bit of a nightmare without access to a machine shop! (Marko?). I had the same problem last year for my Omer, sourced a quality oil filled gauge but then had to get an adaptor made up which, fortunately I had made for me in work.
You need to ensure you get your dimensions spot on before calling in the favours!! Firstly theres the commercial thread diameter and pitch of the gauge which needs to screw into female receptical of the adaptor whilst considering the depth of the bore as you need an O-ring in the bottom which needs compressing before the gauge thread bottoms out. Also a further O-ring located where the adaptor screws into the gun valve, and again depth considerations but also calculations for the length of the needle which dislodges the valve ball. The needle needs to deflect the ball enough just as the adaptor bottoms on the O-ring or else valve will open without a seal being formed (gun air lost) or if too short O-ring will seal but ball won't dislodge. I had mine made up with an overly long needle then carefully filled it down by trial and error. Obviously if you can get access to gauge for your gun I'd either just buy it or take the dimensions from it.
Oh, and take care when unscrewing the gauge!!! residual pressure will sit behind it and 'pop' it off as you unscrew it (thats assuming theres no pressure release button in the design?).
This probably explains why specific gun gauges are so expensive.

Dave
 

So basically better off buying one of the expensive ones made specifically for the gun and hope it works well. Thanks for your help fellas.


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Think it comes down to what access you have to a good Turner? It's not a difficult job for a decent Turner, just make sure you've considered all the critical dimensions.
However, if you can easily get a specific gauge it would definitely be a lot simpler to just buy it. I made mine up purely because getting hold of any pneumatic (Omer) accessories in the UK is not a simple task.
Dave
 

It seems like buying one would be easier than putting it together. Getting an adapter with the pin made to the gauge thread won't be so easy.


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