The Flat Man's Pack contains Pumper's Pack
and the Flat Top Valve Kit.
2021 UPDATE: The piston now features two o-rings for better
compression. Looks a lot more professional, too.
MAY 2021 UPDATE x2: A solid brass
piston is now available. It's fancier. It's heavier. It's bling that only
you know is inside...?
Brass pistons are now available!
Older single o-ring style.