MK2 vs Conshelf 21

[Eric Sedletzky]

If I was to keep only one 1st stage between my MK2 and my Conshelf 21, which one should it be and why?
I hate to get rid of anything but my anti hoarding gene has kicked in and it's once again time to purge stuff I don't use. I can only use one reg at a time and so many of them just sit.

 

[herman]

I do like the MK-2 but between the 2, the Conshelf wins. It's balanced, the IP can be set externally and no internal parts are subject to salt water.

 

[ZzzKing]

What second stages are on the Mk2? I know my Conshelf 21 came with the crappy plastic ones but I switched those out years ago for 14's.

I would probably just keep both.

 

[Eric Sedletzky]

I don't use any of the stock second stages on either. I either use a G200B or 109/156's on both and those ain't going anywhere.

 

[ZzzKing]

I use a 108 with my mk2 on a pony. I think everyone needs a mk2. I've got half a dozen conshelfs.

My wife has given up on me. I went down and got a Titan (conshelf) for her and my little girl so they won't feel like they are using dangerous antiques. After all, this is LIFE SUPPORT EQUIPMENT we are talking about here.

 

[halocline]

If you can hang on for a few weeks, I'll buy the conshelf from you, I've been meaning to get one. I could also trade a 2nd stage, but that doesn't exactly solve your clutter problem!

 

[Eric Sedletzky]

If you can hang on for a few weeks, I'll buy the conshelf from you, I've been meaning to get one. I could also trade a 2nd stage, but that doesn't exactly solve your clutter problem!

Oh man, this is real isn't it, I don't know if I can let go.
I'd rather get rid of my MK20.
Problem is I don't know if it's a brass piston or composite.
But I never use it so it's going to on the chopping block.

 

[ams511]

Eric the Conshelf is the better performing regulator of the two. That said the MK-2 has it beat for ease and cheapness of service. To overhaul the MK-2 you only need a filter, two o-rings and a $2 seat. To underhaul it just relube the rings (If still good) and flip the seat. However if you can Conshelf kits at a reasonable price then it is not much of an advantage.

 

[Eric Sedletzky]

Eric the Conshelf is the better performing regulator of the two. That said the MK-2 has it beat for ease and cheapness of service. To overhaul the MK-2 you only need a filter, two o-rings and a $2 seat. To underhaul it just relube the rings (If still good) and flip the seat. However if you can Conshelf kits at a reasonable price then it is not much of an advantage.

I've lubed up the MK2 a few times now and flipped the seat. It holds steady IP so no problems there. I can get a kit for it for $10. It needs a shim or two.
I went through the Conshelf and put in a kit about a year ago maybe two. I found one at North East Scuba Supply for about $30. Bryan has them for around $35 I think.
Yeah the Conshelf is probably a better performer at low tank pressure because it's balanced, but with a good balanced second stage who cares? As long as the 1st puts out 135-140, the second stage doesn't know what brand or type it is and could care less.

I decided I'm keeping both.
I have a bunch of other stuff I'm selling instead.