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ScubaLawyer
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First Name: Mark
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SPG made especially for 71.2 tanks.

Tue Feb 25, 2020 8:29 pm

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. :)

Image
"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968) :D

swimjim
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First Name: Jim
Location: Belgium WI

Re: SPG made especially for 71.2 tanks.

Tue Feb 25, 2020 8:38 pm

Funny how things come full circle....

h2operations
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First Name: Paul
Location: Coronado CA

Re: SPG made especially for 71.2 tanks.

Wed Feb 26, 2020 6:31 pm

I like the 250 psi reserve line.

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ScubaLawyer
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Re: SPG made especially for 71.2 tanks.

Wed Feb 26, 2020 6:58 pm

h2operations wrote:
Wed Feb 26, 2020 6:31 pm
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. :)
"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968) :D

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SurfLung
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Re: SPG made especially for 71.2 tanks.

Fri Feb 28, 2020 4:59 pm

I Got One Too...
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- 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.
SurfLung
The Freedom and Simplicity of Vintage Equipment and
Vintage Diving Technique are Why I Got Back Into Diving.

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ScubaLawyer
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Joined: Thu Apr 08, 2010 11:25 am
First Name: Mark
Location: Laguna Beach, CA

Re: SPG made especially for 71.2 tanks.

Fri Feb 28, 2020 6:10 pm

Very cool Eben. I like it.
"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968) :D

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Nemrod
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Re: SPG made especially for 71.2 tanks.

Fri Feb 28, 2020 11:51 pm

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

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antique diver
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Joined: Sun Dec 10, 2006 12:50 pm
First Name: Bill
Location: North-Central Texas

Re: SPG made especially for 71.2 tanks.

Sun Mar 01, 2020 8:55 am

Now you have me wishing I had an SPG just reading cubic feet only! :idea:
The older I get the better I was.

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