http://www.tptools.com/tech-metal-piping.dlp (a good general-purpose air delivery system)
Maybe someone will comment on black pipe rusting outside a building?
Galvanized pipe/fittings might be more appropriate (but galvanizing material might slough-off inside the pipe)?
Last edited by tclederman; 04/04/2015 1:33 PM. Reason: added info about galvanized pipe
