I was earlier trying to work out the meaning of the Accutronics number 23572-0 with a bit of searching I found out this means 4FB2A1A, which of course you can’t buy.
The replacement tank is 4FB3A1B.
The main difference is 2 and 3 in the part number the 2 is a medium delay length while 3 is long. The B is the orientation of the tank. B is springs down while A is springs up.
https://www.amplifiedparts.com/tech-articles/accutronics-products-and-sp...
I hope this is of assistance to someone.
Regards
Mark