Any source for triple manifolds out there?

[John C. Ratliff]

The problem with vintage triple manifolds is they are about all exclusively 1/2" taper pipe thread.

That's why I discussed how to make a triple set without a triple manifold on the first page of this thread. It's getting pretty hard to get a manifold for triples without making something like Captain did.

SeaRat

 

[kingairpilot]

Maybe you don't need 90 cuft either?

Sorry, my excuses are: Public School, I had 40's on my mind, and Beer...in that order.




ka

 

[elmer fudd]

The problem with vintage triple manifolds is they are about all exclusively 1/2" taper pipe thread.

I don't suppose there's enough of a difference between a 1/2" NPT and 3/4" NPSM to make an adapter out of an old J or K valve? I was thinking if you just cut an old valve off near the tank neck, then drilled it out to 23/32" and tapped it you'd have a quick and easy way to hook up one of those old manifolds to a modern tank.

 

[duckbill]

Yes, divers used bushings for many years, but they are not well accepted nowadays. There's nothing wrong with a good, pressure-rated bushing. Steel and stainless work fine, but I don't know if brass would be such a good idea. Most shops would not fill a bushed tank.

 

[captain]

The manifold is fairly easy to fabricate. I do most of the work on a lathe but a good fabricator could do almost as well with just hand tools and elbow grease.

 

[John C. Ratliff]

Yes, divers used bushings for many years, but they are not well accepted nowadays. There's nothing wrong with a good, pressure-rated bushing. Steel and stainless work fine, but I don't know if brass would be such a good idea. Most shops would not fill a bushed tank.

Bushings were used in the early days when many scuba tanks were converted fire extinguisher bottles.

SeaRat

 

[Akimbo]

Bushings were used in the early days when many scuba tanks were converted fire extinguisher bottles.

SeaRat

You can see some of those bushings on the black tanks behind the Delta Triples in that B&W photo above. They were readily available NPT bushings with tapered pipe-to-pipe threads though. Do you know of an O-ring sealed straight thread adapter? It would be nice if you could at least buy a plug for an O-ring sealed ¾ NPT straight thread Scuba cylinder and bore it out for whatever smaller diameter thread you like.