It has to be specifically a firestone ball lock liquid post, correct? I tried this a while back and it didn't work right, the poppet didn't close, like the post didn't screw on far enough. So I'm thinking I didn't have the right disconnect as I used a post off one of my used kegs, Super Challengers, I think.
I'd like to give this another go. Don't have a Home Depot in my area, but there's an equivalent pump at Ace I can pick up.