Are there smaller neck size steels than 3/4”?

[rvojr]

Someone bought it without the neck information. I guess they didn't care or knew what it was. I asked too many questions for the seller.

 

[Whitrzac]

Someone bought it without the neck information. I guess they didn't care or knew what it was. I asked too many questions for the seller.

Not surprising...
Why deal with someone kicking tires and asking 500 questions when someone with more knowledge of tanks knows what they are and pays promptly?

 

[Scared Silly]

From the one pictures showing the TP 5250 that would immediately indicate that the cylinder has a working pressure (WP) 3500psi. The test pressure for such cylinders is 3/2 of the WP, 3500 * 3/2 = 5250. Such cylinders all have 7/8" UNF thread. Which in turn means the values have 7 threads (aka 300 bar). QED.

 

[Jack Hammer]

From the one pictures showing the TP 5250 that would immediately indicate that the cylinder has a working pressure (WP) 3500psi. The test pressure for such cylinders is 3/2 of the WP, 3500 * 3/2 = 5250. Such cylinders all have 7/8" UNF thread. Which in turn means the values have 7 threads (aka 300 bar). QED.

Not to nitpick, my 3442psi rated cylinders have a 5250tp.

 

[Scared Silly]

Not to nitpick, my 3442psi rated cylinders have a 5250tp.

That is a good nitpick. I have not looked closely at too many 3442 cylinders. But yup: Cylinder Markings — XS Scuba - Everything For The Perfect Dive