O-rings for Rebuilding 7/8 Sherwood Manifolds?

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Doc Harry

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That was my plan, until learning that (Doh!) Northeast carries a set.
If they just sell you a kit without giving you the o-ring dash numbers, then you're almost as bad off as before.

If they don't give you the dash numbers, be sure to measure the o-rings and determine what number they are. For future reference.
 
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Tracy

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Honestly, that was a **** manifold when it was new. It hasn't gotten better. It makes an OMS face seal manifold look reliable. A good hard knock on either end of either tank will start them leaking.
There is a reason everybody abandoned that design and went to double O-ringed barrels.
It is one thing to be cheap, but not at the risk of total gas loss.
 
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OTF

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Honestly, that was a **** manifold when it was new. It hasn't gotten better. It makes an OMS face seal manifold look reliable. A good hard knock on either end of either tank will start them leaking.
There is a reason everybody abandoned that design and went to double O-ringed barrels.
It is one thing to be cheap, but not at the risk of total gas loss.

Interesting to hear, thank you. I agree it seems like a somewhat silly design internally. Although everyone else I've asked said they were fine manifolds.
 

rx7diver

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Interesting to hear, thank you. I agree it seems like a somewhat silly design internally. Although everyone else I've asked said they were fine manifolds.

I purchased mine new in 1994 or so. Dove it for several years with Sherwood Genesis (PST) HP 100's (purchased new about the same time) for extended range wreck dives in the Great Lakes. It always worked well. Never an issue. Even with very generous fills.

I still have it--although I ceased diving it in 1997 or so when I purchased HP 120's and an OMS manifold and bands.

I think you can trust your manifold. I wouldn't hesitate diving mine again if the need arises. Enjoy.

rx7diver

P.S. Historically, the "Sherwood Double-DIN" manifold was the first isolation manifold seen here in the U.S., I think. @tbone1004 or @Akimbo would know for sure, I think.
 
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rx7diver

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I purchased mine new in 1994 or so...

I have a bit more time now, so I'll continue: The only reason I replaced my Sherwood Genesis Double-DIN isolation manifold with the OMS isolation manifold was due to the bands. The bands I purchased with my Sherwood manifold were "first-generation" DiveRite bands that were/are a bit anemic, a bit flimsy. The HP 120's are much heavier than the HP 100's, especially when cave-filled, and almost immediately I decided I wanted to use beefier bands with the HP 120's. The OMS bands that match the OMS manifold were/are much sturdier, and much nicer.

(Note: The valve-to-valve distance for the OMS manifold is wider than the valve-to-valve distance for the Sherwood manifold.)

rx7diver

P.S. I still have my OMS manifold and bands, too. The OMS manifold is the "face-seal" manifold that someone above mentioned. This manifold, too, worked/s perfectly for me. I ceased diving it in 2003 or so, when I ceased diving manifolded doubles, after I had moved it, briefly, to double Luxfer Al 80's. (I had purchased the 3/4" modular valves to use with the isolation part.) However, I likely will resurrect it soon to use with baby doubles (OMS/Faber LP 46's) I am currently playing with.
 
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