Scubapro O-ring Sizes

[Couv]

Re: duro 70/75 vs. 90.... I too like to use duro 90 in most application where there is large pressure differential. Like Matt said, hp o-ring, hp plug, yoke retainer, tank valve, etc. To keep things simple, I install them almost every place they fit. One problem area I found is the second stage orifice, so a soft -010 or a slightly thinner o-ring goes there. However, I don't get my knickers in a twist about installing a 90 duro it if I can be easily accessed (like an hp plug) because the problem will be easy to spot and easily remedied. But if there is a place like the piston stem that is not so easily dealt with, then I'll go out of my way to make sure I have a high durometer o-ring installed there. I use the same philosophy for quality, I know that aviation grade o-rings cost a little more, but because they go through a higher quality control process, I tend to have more confidence in them. Basically, used and "source unknown" o-rings only get put on port plugs....and sometimes on my water softener.

c

 

[redacted]

The good news is the Trident "rivet style" seat seems to work like a charm. It is Trident part number A148 in their 2010 catalog. And the price was surprisingly affordable. The 2 HP seats look good but they cost me $10 each. I can buy SP seats for under $5 each so unless there is some mistake, I'm not even going to try them out. Unfortunately, none of my regs need an HP seat replacement so, unless we can find a more reasonable price, no sense in fixin' a reg that isn't broke.

I'll gave Scubatoys a call and they will talk to the Trident rep about prices. The rivet style LP seat was only $1 and I thought that was surprisingly low. I expected something around $2 as I have bought Scubapro balanced poppet seat in the past for about $2.50.

 

[Texfrazer]

awap, thanks for your work on getting seats.

If we could make our own by machining a teflon rod, that might work for those of us without a cache, but I'd like to find a better source.

 

[superstar]

awap, the trident rivet seat #A148 is a replacement for the seat on the bal.adj. poppet assembly and costs $10 ea, correct?

 

[redacted]

awap, the trident rivet seat #A148 is a replacement for the seat on the bal.adj. poppet assembly and costs $10 ea, correct?

I used it to replace the Scubapro balanced barrel poppet seat in a Balanced Adjustable (156/G200B/G250/Sxxx & probably the X650). And the cost was only $1!!! Scubatoys is going to talk to the Trident distributor and make sure cost I paid were correct. It was the HP seats that were $10 each and that is too much.

BTW, I ran into a new downside of using the -010 with a metal orifice. I had a hell of a time removing an orifice that had been installed with a -010 quite a few years ago. This was in an old beater 109 that only saw FW use. I decided to test the Trident seat in it so I converted it to Balanced Adjustable. The orifice was a bit tight and after clearing the threads, I could not get it to push out. I lubed the surface of the barrel and used the pencil reaser to avoid damaging the knife edge but it just did not want to come out. Once I finally got it, I replaced the -010 (I could tell by the color) with a -902 and it installed quite easily. Maybe the -010 is a bad idea even if it does fit.

 

[superstar]

awap, I got it, the Trident #A242 is the hp seat for the mk5/10 and was $10. The last mk5 kit I got on e-bay cost me about $20 and all I wanted from the kit was the hp seat so $10 does not seem that bad especially when I can stiff SP.

 

[redacted]

awap, I got it, the Trident #A242 is the hp seat for the mk5/10 and was $10. The last mk5 kit I got on e-bay cost me about $20 and all I wanted from the kit was the hp seat so $10 does not seem that bad especially when I can stiff SP.

A Mk5 kit went on ebay yseterday for $11 plus $6 shipping. It included the 3 HP seats of very small difference in sizes and the filter. Most reg will be able to use at least 2 of the seats and good possibility of using all 3 with shims. I figure an aftermarket seat should go for no more than $4. I'll post when I find out anything.

 

[Couv]

..... I figure an aftermarket seat should go for no more than $4. I'll post when I find out anything.

Yes, that's what I was thinking....even at $21 for a kit, you get 3 seats, and a filter.

Awap, I was looking at my old beat up MK10 w/DIN....that is the only DIN reg I have so I might be confused on the parts count. I seem to be missing a washer that goes between the filter and o-ring. Please see the MK10 chart I posted, it is item 36. Is this a special washer or set of washers? Is there an Awap "work around" ? It looks like it would be important because just putting the o-ring over the filter would not make a seal between the DIN retainer (item 34) and body.

Couv

 

[HenrikBP]

I seem to be missing a washer that goes between the filter and o-ring. Please see the MK10 chart I posted, it is item 36. Is this a special washer or set of washers?

It's a fairly "chubby" little washer that goes in there - not a stack. Don't have any good ideas for a replacement, but I can try to get measurements this weekend so we can look around for something that'll fit.

Henrik

 

[redacted]

I'll check this W/E also when I try to move my Mk10 din to a Mk5. The Trident din retainer has a very substantial metal washer in that location that sit against a metal shoulder and holds the filter upstream and, more importantly, provides the correct spacing for the o-ring that is downstream.

And, yes I believe we can come up with a workaround. I'd bet you must have a couple washer stores in the big city that will have just what you need once we get some measurements.