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It should be the standard thread for any other tank valve of 3/4"X14 Straight thread.

Only a select few tanks for scuba application (in America) were ever made with other threads.

Edit: Correction, some 3500psi tanks had 7/8"X16 straight threads
 
Wow, not sure on the specific brand. Most tanks are 3/4"-14 NPT. Older tanks sometimes had 1/2" tapered thread, but they're few and far between anymore.
 
Can you provide the tank stamping information?
 
is there anything that makes you think the tanks would be anything other than 3/4"-14 NPT?

that's the overwhelming standard in the US
 
Tank is 4 years old DOT E13483-3500 3216355y TP5250 HP100
 
3500 psi cylinders are 7/8" threading, as far as I know.
 
3500 psi cylinders are 7/8" threading, as far as I know.

hmmmm ... you're right:

When Pressed Steel Tank Company began manufacturing the modern 3500 psi service pressure SCUBA cylinder, they elected to use a more modern thread form for the neck opening known as Unified National Standard Fine. The specific thread form used with the steel 3500 psi SCUBA cylinder is named 0.875-14 UNF, often referred to as "7/8 UNF."

SCUBA Valves: Regulator Fittings, 200 vs 300 Bar FAQ and Cylinder Neck Threads - Dive Gear Express
 

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