In the upper Midwest theres a chain called Menard's and they had 6 packs of 5/8" stainless flat washers for $1.50 or so. My only issue is that I can't get the hose barb and ball valve far enough onto the nipple for the 10 gallon tun unless I use like 9 washers, and the whole thing is too narrow for the current 5 gal home depot HLT. ( I'm using a 5 gal. HLT and a 10 gal. M/LT). I'll be using for fly sparging once I can get the right parts for the 5 gal. Any suggestions for either dilemma?