SPG made especially for 71.2 tanks.

[ScubaLawyer]

Came across this Swimaster SPG attached to a reg someone gave me. Standard 3000 psi limit but marked off in cu. ft. showing 71.2 cu. ft. at 2475 psi (10% overfill). Kinda cool. Guess they figured folks only used that size steel tank.

[swimjim]

Funny how things come full circle....

[h2operations]

I like the 250 psi reserve line.

[ScubaLawyer]

I like the 250 psi reserve line.

Back in the day we didn't need no stink'n reserve... Out of air? Just grab that last lobster and blow and go for the surface.

[SurfLung]

I Got One Too...

- I think mine might have come off a tank checker. I got it off Ebay a week or so ago for $18. Since I use my compressors to fill vintage tanks, my tank pressures are usually 1800 to 2500 psi. The usual new gauges go up to 7000 psi. These give a finer reading for lower pressures.
- Nowadays the attitude is "Oooh... 10% Over... Cave Fill!" And then you see this gauge where they actually printed it right on the gauge. That tells me it was/is an accepted practice.

[ScubaLawyer]

Very cool Eben. I like it.

[Nemrod]

Thanks, I had forgotten about those. I used to have one. I have no idea where it went. Where all the good things go I guess. Nem

[antique diver]

Now you have me wishing I had an SPG just reading cubic feet only!