This has probably been posted but for those who can't search thru every post I just wanted to pass along some useful info, my full size subtank developed a leak at the bottom o-ring rather quickly, rather than dealing with a replacement from kanger or spending 1.99 from them plus shipping I found a suitable replacement at Ace / Tru Value hardware etc, a #32 oring is a tab beefier and seals this bad boy up for .69 
