my Low dollar 318 hop-up project

IF the valve seals are real soft and feel fairly new, you can re-use them. I would suggest new if you have any doubt, they are about 20.00 bucks for new Fel Pro's.

A lot of folks emphasize on keeping the order of the valves. It's not a bad suggestion at all, but I've mixed them up and never been penalized for it.... Keeping them in order is the best way...