On Thu, 10 May 2007 12:14:32 -0400, krj
wrote:

Apollo and Groco seacocks have NTP (tapered)
top thread and the bottom thread is NPS (straight).

And you can probably bet that at least the Grocos are made with the
right type of bronze, not true with the hardware store variety which
is actuall brass (copper and zinc) vs naval bronze which is primarily
copper and tin. The issue with brass is that the zinc will disappear
over time due to electrolytic action.