Christian McArdle wrote:
I thought the valve threads would be taper fit, but they're not; they
don't tighten to seal.
(...)
Tips on getting a seal?


Well I am sure they are taper fit, but as with all taper threads, they
are designed to seal with a "Helping Hand" whether that be from PTFE or
Fernox LS-X. It should just be a case of adding more PTFE.

Hope this helps,
Luke