Minimum o-ring / o-rings / o ring / o rings set?

[wetman]

I was wondering if someone could give me complete list of orings that would be essential for a good save a dive kit. I just ordered a monster kit of orings (at quite a fantastic deal actually) so i should have many to pick and choose from. I'll be getting some viton ones separately for 02 clean yoke tank valves - but i'm thinking other orings here.

Thanks for your help.

steve

[Scubaroo]

If it's of any use, I recently ordered the following from Reef Scuba for my save-a-dive kit based on my regulators and valves:

003 - HP hose SPG spool (viton)
010 - LP hose/2nd stage interface (viton)
011 - 3/8" LP port (buna/viton)
012 - 7/16" HP port (buna/viton)
013 - 1/2" LP port (viton)
014 - yoke valve (buna)
112 - DIN valve (viton)

The buna o-rings are not for personal use, rather to have on hand for other people - I don't want any buddies' potential lack of prepardness to screw my dives :) These o-rings cover the full set of o-rings external to the regulators that can be easily fixed at a dive site. An o-ring pick is a useful addition to the save-a-dive kit as well - some like the LP hose/2nd stage interface o-rign are near impossible to remove and replace without one. Also throw in some lubricant - I've switched to only using Christolube on regulator o-rings - it's expensive but a little goes a looooong way.

[wetman]

I actually ordered the buna-n from this page:

http://www.allorings.com/oring_kits.htm

Thought it was a good deal. Will round out the rest from mcmaster-carr i think in viton/buna-n if any are missing. I just want to make sure i'm not lacking in my SAD kit and will pick then necessary ones out of that kit. Thought it was a pretty good deal. Got the brass oring tools from them as well.

steve

[Braunbehrens]

allorings also has viton orings. that's where I get mine. I just got all vitons, what the heck...it's only a few cents.

[Genesis]

http://www.air-oil.com/oringsonlinefset.htm

Pretty tough to beat...

[OUTDOORAMN69US]

I am looking to put together a Save a dive kit, what are the std sizes of o-rings I need?

[Scubaroo]

See here:

http://www.scubaboard.com/t29178/s.html

[scubasean]

Scubaroo once bubbled...
If it's of any use, I recently ordered the following from Reef Scuba for my save-a-dive kit based on my regulators and valves:

003 - HP hose SPG spool (viton)
010 - LP hose/2nd stage interface (viton)
011 - 3/8" LP port (buna/viton)
012 - 7/16" HP port (buna/viton)
013 - 1/2" LP port (viton)
014 - yoke valve (buna)
112 - DIN valve (viton)



Out of curiousity, how did you determine which O-rings are in your gear?

I'd need an illustrated parts breakdown, right? Or are there standard sizes?

--Sean

[Scubaroo]

These are standard o-ring sizes for hose fittings and tank valves. About the only variations to this list that the average diver would have to make would be dropping the 112 DIN o-rings if they don't use DIN fittings, and the 013 1/2" LP port o-rigns if their regulator uses all 3/8" LP ports.

This isn't meant to be a list of o-rings you can do a regulator service with - more a list for "in-the-field" (or more accurately, on-the-boat or in-the-carpark) type save-a-dive repairs.

[newdiverAZ]

why such a huge price difference between those 2 sites? A viton o-ring is a viton o-ring isn't it? all o-rings is like almost 4 times more.

[Genesis]

Small quantities of O-rings are BIG mark-up items.

It is possible that some suppliers sell junk, but air-oil is a fairly significant industrial supplier and has been around for quite some time. I've used their products and haven't had trouble with them.

Do pay attention to the hardness ("duroimeter") ratings if there is a specific use that requires a harder compound .vs. a software one. Not really much of an issue for things like a yoke valve sealing O-ring, but it can become important for O-rings internal to regs and the like.

[NetDoc]

and use my O-Ring stretcher... he sure does complain! :tease:

[newdiverAZ]

you can buy 100 of all of the o-rings on that list for 60$. That would last a long time. in viton that is.

[newdiverAZ]

are all the buna o-rings 70-durometer?

[Genesis]

The site that I posted the link to has two different Buna-N hardnesses. There is NO WAY to tell them apart by looking at them - make sure you label your bins correctly!

For most uses 70 duro is fine; exceptions are typically, once again, on internal reg components.

There is no universal agreement on whether Viton is really a good idea with Nitrox or not. Viton is LESS shear-resistant than Buna-N for equivalent hardness, and while its harder to ignite Viton, its not impossible to do; further, if you DO get Viton lit you get some really ugly combustion products. Viton will last longer than Buna-N in a high-FO2 environment, but that's a relative thing too, since you probably will be changing them every year or so, right? :)

[equipto76]

Check out the O-Ring kits from www.reefscuba.com. I carry one in my save-a-dive kit and it's come in extremely handy several times. It's paid for itself in the dives that it's saved.

[FredT]

Scubaroo once bubbled...
011 - 3/8" LP port (buna/viton)
012 - 7/16" HP port (buna/viton)
013 - 1/2" LP port (viton)
Also throw in some lubricant - I've switched to only using Christolube on regulator o-rings - it's expensive but a little goes a looooong way.

If actually doing it according to the book:
3/8" LP port uses a 3-903
7/16" HP port uses a 3-904
1/2" LP port uses a 3-905

The cross section and size for those joints are defined by SAE, MS33656, and MS33657 to provide consistant sealing specs. They are NOT the same as the 2-0XX series! All are available in Viton (Parker compound V884-75)


FT

[jrudicel]

I am looking for anyone with specifics on some Orings I will be needing. I can just go to a dive shop and go through the hassle with them finding them, but would just rather buy my own through various companies we deal with at work like Mc Master Carr etc., that way I'll have spares anyway. I could try and measure them etc with calipers and such, but if anyone knows the specifics, it would save the time. I have PST 104's in doubles with the Halcyon 300bar manifold. I am due to bust them down, simple green and viz them, and want to replace the tank orings and the manifold orings while there. Anyone know the dash numbers, duro numbers, etc? Buna, Viton, etc? Obviously I am using them for pp filling as well. Thanks for anything you can give.

[froddo]

You can tell the hardness by rubbing the orings against hard surface. 90 will be harder than 70.

[GreenDiverDown]

Anyone know the answer to this?

[scubasean]

Oring questions have certainly been asked before, but I'm not sure if those answers apply here...

In case it might help, you may wish to try

http://www.scubaboard.com/showthread.php?s=&threadid=29178&highlight=oring

Cheers,

Sean

[GreenDiverDown]

Thanks...but I was looking for the sizes for the barrel o-rings on the Halcyon manifold.

Can't seem to find out.

SA

[LUBOLD8431]

They are usually 011 (or is it 012...) , and more than likely 70 durometer.

I usually have a kit, so I never really size the orings. Just get the service kit from the manufacturer, and you are all set...

[GreenDiverDown]

You're funny.

I guess I can go up to my shop and dig thru the O rings. But I was hopin' that someone might know so that I could order a hand full.

SA

[LUBOLD8431]

Well, its only two options, so you can buy both, and you know that you got the right size, at least...



Or, are they 013??????


Hmmmmm.....

Yeah, I would just buy the kit...

[GreenDiverDown]

Arggh!!!

[cobaltbabe]

Buy the kit Steven. If you just put an off the shelf O ring in, even though it may have came from the same batch as a packaged one, if the one in the package blows, it is warrentied in most cases.

[jrg]

The LDS down the street doesn't use O-rings out of a kit (unless it's some kind of special o-ring), so why should you? They order them in bulk for about a penny or two a piece.

I ordered a bunch from air-oil.com, and they were delivered to my front door the same week.
http://www.air-oil.com/oringsonlinefset.htm

[Dan Gibson]

3-902 Manifold Barrel Parker 3-902V894-90





LUBOLD8431 once bubbled...
They are usually 011 (or is it 012...) , and more than likely 70 durometer.

I usually have a kit, so I never really size the orings. Just get the service kit from the manufacturer, and you are all set...

[kgdiver]

www.reefscuba.com is the best source I have found for O rings and other dive accessories. Good selection of all sorts of goodies.

[khel]

FredT once bubbled...


If actually doing it according to the book:
3/8" LP port uses a 3-903
7/16" HP port uses a 3-904
1/2" LP port uses a 3-905

The cross section and size for those joints are defined by SAE, MS33656, and MS33657 to provide consistant sealing specs. They are NOT the same as the 2-0XX series! All are available in Viton (Parker compound V884-75)


FT

So, as far as I understand, I should order
3-90x instead of 2-0xx ??

Thanks

khel

[RiverRat]

So, as far as I understand, I should order
3-90x instead of 2-0xx ??

Thanks

khel

I've had the same question, all docs I've seen so far reference 2-0xx. I'm trying to cross reference now with a vendor. According to FredT there is a size difference.

[lairdb]

I've had the same question, all docs I've seen so far reference 2-0xx. I'm trying to cross reference now with a vendor. According to FredT there is a size difference.

2-xxx are specified in imperial measurements, 3-xxx in metric.

AirOil has a great size reference here (http://www.air-oil.com/sizechart_frmset.htm).

Putting everything in decimal inch terms, as AirOil's crossreference does:
A 2-011 has an actual ID of 0.301 and crosssection of 0.070.
A 3-903 has an actual ID of 0.301 and crosssection of 0.064.

Whether those are "close enough", and which is "correct", is left as an exercise.

--Laird

[RiverRat]

I have a question maybe someone can answer. I just popped the o-rings out of my PST E-7 100's with Thermo convertable valves. Looks like "fat" o-rings in there, although the "skinny" 2-014's fit and appear to have the same ID (inside diameter).
Does anyone know what is supposed to be used in these valves? Standard 2-014 o-ring or the "fatter" version I've heard about?