I was gonna say Anvil but looking at their site I don't see any fittings in brass, only steel.
Anvil Pipe Fittings
And for those that wonder, their manufacturing facilities are here in the USA.
You have to be willing to look for the few that are left, but they deserve our
support where earned with quality product and fair pricing with a bit of helpful
customer service thrown in. We buy from them all the time and many local plumbing
suppliers carry tPipeproducts. U.S. Pipe, one of the three companies that make up Mueller,
is one of the last manufacturers casting large bore pipe in the US I recently found out when
ordering a 42" CI 45.
Many of you may recognize their previous name, Grinnell, which when Grinnelll was bought
by Tyco and then later sold Tyco retained the Grinnell name.