The Grail

[Geo7]

I think it has been in the G250s and BAs to prevent that one could accidentally turn the adjustment knob too much in, increasing the cracking effort into unacceptable ranges........
I couldn't see how it could help to protect anything while transported.

But doesn't basically make it a "non-adjustable" 2nd stage? It severely limits the range of the adjuster on my reg. First time I see this...

 

[Open Ocean Diver]

But doesn't basically make it a "non-adjustable" 2nd stage? It severely limits the range of the adjuster on my reg. First time I see this...

No, it has a range. But it is designed to be removable. If you get a chance take a picture of your serial number, I want to compare with mine. Thanks

 

[Geo7]

Ok, will do tomorrow

Yes it is easily removable.

It also has a very different main diaphragm. Black, sturdier and with four bumps. Patented.

 

[rx7diver]

I think it has been in the G250s and BAs to prevent that one could accidentally turn the adjustment knob too much in, increasing the cracking effort into unacceptable ranges........
I couldn't see how it could help to protect anything while transported.

It wasn't installed on my three Balanced Adjustables and single G250 (IIRC), all purchased new in 1987 and 1988.

rx7diver

 

[Open Ocean Diver]

Ok, will do tomorrow

Yes it is easily removable.

It also has a very different main diaphragm. Black, sturdier and with four bumps. Patented.

Your diaphragm is it different from this?

 

[Open Ocean Diver]

It wasn't installed on my three Balanced Adjustables and single G250 (IIRC), all purchased new in 1987 and 1988.

rx7diver

On the schematics translated from Italian to English… it’s called a knob spacer.

 

[Open Ocean Diver]

The CE is very special. Has the same exhaust valve as the G260 and a housing sleeve similar to the G260.

 

[Geo7]

Your diaphragm is it different from this?

Yup, I can take closer pics.

I also have a G500 with this style of chunkier diaphragm.

 

[Geo7]

The CE is very special. Has the same exhaust valve as the G260 and a housing sleeve similar to the G260.

Mine does not have the housing sleeve though...

 

[Geo7]

156CE diaphragm, and diaphragm from early metal barrel G500 (EU version with grey S" on purge cover)