Conshelf 22 port sizes

[buddhasummer]

You know, they make 1/2-3/8 adapters-probably the wrong color though.

Where ever did you get the idea I care about colour or matching? I think someone's besmirching my good name.

 

[larsdennert]

Here is my 90's Conshelf 22 and the first stage. Mine has only 3/8" ports. Still a great reg. One of my kids is using the first stage with my Atomic B2 second stage.

 

[buddhasummer]

Here is my 90's Conshelf 22 and the first stage. Mine has only 3/8" ports. Still a great reg. One of my kids is using the first stage with my Atomic B2 second stage.

View attachment 560871View attachment 560872

Out of curiosity, what's your favorite second stage. Cheers.

 

[GJC]

Here is my 90's Conshelf 22 and the first stage. Mine has only 3/8" ports. Still a great reg. One of my kids is using the first stage with my Atomic B2 second stage.

View attachment 560871View attachment 560872

Are you sure it's a 22 and not a 21?
Are you the first owner?

I didn't know there were 22s like that.

 

[larsdennert]

The 2nd stage says 22 but I thought it was a 14 or 15.

My favorite is the legend. Breathes like you don't have a reg. I need to try the apeks legend and a700 side by side next time I go out. That would be good. I dove the titanium atomic for years but every legend I've tried just feels like another level to me.

 

[Angelo Farina]

Sorry for going partially OT. I need a clarification on these not-metric measures.
Here in Europe, a 10 mm screw, when measured, has a diameter of... 10 mm!!
Those "imperial" measurements in inches, instead, are quite unclear to me.
Let's start from the standard port for LP and HP hoses. In most regulators, the LP port is declared to be 3/8", and the HP port instead is declared to be 7/16".
Measuring them with a digital caliper I get these diameters:
3/8 => 0.36" (it should be 0.375)
7/16 => 0.42" (it should be 0.4375)
So we are almost there...
On the other side, I went to a local hardware store, and asked for a 3/8" nipple, and I got this object here:

Which has a diameter much larger, approximately 0.656".
So I am not understanding: the measurements in inches used here in Europe for compressed air, gas or water connectors seem to be completely unrelated to the measurements in inches used for regulators.
Can you explain me what's the difference?

 

[Zef]

Sorry for going partially OT. I need a clarification on these not-metric measures.
Here in Europe, a 10 mm screw, when measured, has a diameter of... 10 mm!!
Those "imperial" measurements in inches, instead, are quite unclear to me.
Let's start from the standard port for LP and HP hoses. In most regulators, the LP port is declared to be 3/8", and the HP port instead is declared to be 7/16".
Measuring them with a digital caliper I get these diameters:
3/8 => 0.36" (it should be 0.375)
7/16 => 0.42" (it should be 0.4375)
So we are almost there...
On the other side, I went to a local hardware store, and asked for a 3/8" nipple, and I got this object here:
View attachment 560933
Which has a diameter much larger, approximately 0.656".
So I am not understanding: the measurements in inches used here in Europe for compressed air, gas or water connectors seem to be completely unrelated to the measurements in inches used for regulators.
Can you explain me what's the difference?

Measure the inside threaded dimension of the nipple you bought.

-Z

 

[larsdennert]

I think everyone refers to the hoses as 3/8 due to their od thread size. The id is likely 1/4” meaning a 1/4 an, npt or bsp is what is actually the fitting. The male and female are always slightly different so they will thread into each other.

I've not verified this. Just speculating because miflex advertises their internal hose diameter as .26". Warning: do not thread a npt fitting with tapered threads into your regulator. Likely regulators are A&N (Army Navy) fitting based on a historical guess and function.

 

[Angelo Farina]

Measure the inside threaded dimension of the nipple you bought.

I measured the Internal Diameter (ID) of a 3/8" female adaptor, where my 3/8" nipple fits perfectly. Such an ID is 0.588". So I do not understand why these "compressed air" adaptors and nipples are so far from their "nominal" size, whilst the hoses for regulators have an Outside Diameter (OD) which is quite close to the nominal values...
I also see that regulators use cylindrical screws, whilst on compressed-air or water components both cylindrical or conical screws are available (and of course they should not be mated).

 

[larsdennert]

From another thread:

UNF 3/8-24 - regulator to hose thread for IP
UNF 5/8-18 - thread for Spareair or paintball tanks
UNF 7/16-20 - HP thread in regulator or SPG (Surface Pressure Gaufe)
UNF 9/16-18 - Thread between 2nd stage and hose

Threads in diving regulators etc, o-ring sizes