Acetylene tank threads

[Mobydick]

I need to order a new Acetylene regulator and I can't remember the CGA number for the tank threads. There are three Acetylene numbers, 300, 510, and 520. I am fairly certian its the 510 but I don't have a tank handy. Is 510 correct?

[wizard_Drd]

I need to order a new Acetylene regulator and I can't remember the CGA number for the tank threads. There are three Acetylene numbers, 300, 510, and 520. I am fairly certian its the 510 but I don't have a tank handy. Is 510 correct?

510 is the most common, while 300 is for large commercial tanks. 510 is a male regulator and 300 is a female regulator.