[barney]

Lamar English developed this slick modification

It basically modifies the ADV with the addition of a standard BC inflator male QR post. This provides another way to input offboard diluent, or the removal of the manual add valve on exhale counterlung should you want to streamline your rig, reduce clutter, or minimize failure points (Hogarthian rebreather configuration ). It also allows you to easily strip your rig down if you run your hoses low-profile and thru the wing.

The following images detail the modification. Just follow the steps to make the modification. All fittings have already been loosened and the shots are just for illustrative purposes...


1. ADV with Apeks shutoff.


2. ADV with threaded fitting.


3. Bare ADV.

Next steps below...

[barney]

4. These are the two parts you need to make the modification.


5. Flip your shutoff valve and thread directly into the ADV body. To keep the shutoff direction the same (i.e., muscle memory), I have switched to an M&J Engineering shutoff valve.


6. Add the threaded fitting into the end of the shutoff valve.


7. Add the QR valve and you are good to go.

Thanks again Lamar!

[jknox]

This is nice, although Cedric has had something similar for at least a year. However his I believe was a custom part from M&J so lacking all the extra connectors.

My only concern that has kept me from doing something like this in the past is how quickly can the loop be flushed at depth? Can the ADV still be used for "open loop"?

[barney]

Quote: (Originally Posted by jknox)

This is nice, although Cedric has had something similar for at least a year. However his I believe was a custom part from M&J so lacking all the extra connectors.

Interesting. I just checked his site and saw a reference to the M&J part here:
http://www.cedricverdier.com/writings/MegMods.pdf
Will have to check with M&J to see if that custom part is available. In the interim, I guess the other mod will suffice.
Cheers,
Mike

[jknox]

Quote: (Originally Posted by barney)

Interesting. I just checked his site and saw a reference to the M&J part here:
http://www.cedricverdier.com/writings/MegMods.pdf
Will have to check with M&J to see if that custom part is available. In the interim, I guess the other mod will suffice.
Cheers,
Mike

When I contacted M&J they were pretty much not interested with dealing with customers directly but refered me to a distributer so I eventually gave up looking. Maybe you will have better luck being located in the same time zone.

Have you found that the standard QC reduces the flow rate substantially over the standard fitting?

[PacketSniffer]

Quote: (Originally Posted by jknox)

Have you found that the standard QC reduces the flow rate substantially over the standard fitting?

This is a good question because M&J made their own version of the LP Quick Disconnect that is used for breathing applications. It's not compatible with the "standard" LP fittings that are in the industry (found this out the hard way). I wonder which version they used for Cedric's one-off? If they did use their own version, the question becomes: Do you use M&J QDs and convert all of your Quick Disconnects and have a nice solution that works (breathes well) and become non-standard with everyone else (outside of your immediate team)?

[barney]

Quote: (Originally Posted by jknox)

When I contacted M&J they were pretty much not interested with dealing with customers directly but refered me to a distributer so I eventually gave up looking. Maybe you will have better luck being located in the same time zone.

Have you found that the standard QC reduces the flow rate substantially over the standard fitting?

I got a response from M&J and it sounds like Cedric did the same thing and it was not a custom part.

We used the standard QR so that any LP whip will connect to the ADV and is interchangeable between teams (using standard hose connectors).

I personally have not found the flow to be substantially reduced based on goofing around with it on dry land (I have not run time trials or anything). Based on my intial impressions, I don't think the time to flush the loop would be significantly different between running the gas through the ADV mod or through the redundant manual add valve.

FWIW, I plan on running some tests during some upcoming dives, as I am curious how beneficial this mod will be under real-world situations.

Mike

[Joe]

Quote: (Originally Posted by PacketSniffer)

.....If they did use their own version, the question becomes: Do you use M&J QDs and convert all of your Quick Disconnects and have a nice solution that works (breathes well) and become non-standard with everyone else (outside of your immediate team)?

IMO no. You could breathe enough to survive off the QD even though it may not breathe like a G250. OTOH, any non standard fitting arrangement reduces versatility and ultimately could be the direct cause of your or a team mates premature demise.

I prefer to have my kit such that I could go to any diver and get gas from him and not have to circumvent the obstacles presented by non standard gear.

[PacketSniffer]

Quote: (Originally Posted by Joe)

I prefer to have my kit such that I could go to any diver and get gas from him and not have to circumvent the obstacles presented by non standard gear.

I agree. So, I had mine sent back to M&J Engineering as soon as I found out (before in-water use) they weren't standard. I even informed them that they needed to be standard with the industry before they shipped them. Oh, well...

[jknox]

Quote: (Originally Posted by barney)

I personally have not found the flow to be substantially reduced based on goofing around with it on dry land (I have not run time trials or anything). Based on my intial impressions, I don't think the time to flush the loop would be significantly different between running the gas through the ADV mod or through the redundant manual add valve.

FWIW, I plan on running some tests during some upcoming dives, as I am curious how beneficial this mod will be under real-world situations.

Mike

Great, would like to hear how well it works in the real world.

The benefit that I see and wanted the setup for is the ability to hook O2 up to it on deco, call me lazy... Off-board dil for extremly deep dives (which I am not doing yet...) i guess would be another possibility Other than that I am not sure the benefit...