RF08 is the vertical adapter. Are you sure it's not the orings on it? If the orings are fine, then the vertical adapter should not leak. I'd get some DOW55 from either a local paintball shop or www.macrolineguy.com
and put it on those orings. Also, a new oring might be needed, and that is another part you can get from your local paintball shop or via an online source.