I've gone thru a few inexpensive 6 ton bottle jacks because I stored them on their side, even with bleeder valve up they all leaked.More times than not, bottle jacks will leak from the bleeder valve. You can replace the o-rings with chemical resistant ones but depending on how it's machined, it may or may not fix the leak.
Bought mine used and it didn’t come with one. Sadly
my stock jack didn't last very long with 37's, have a backup plan for when it fails