In a recent thread there was a good discussion of air fittings and
hoses, etc. I mentioned my favorite Milton V-series high flow types
for making economy compressors more effective. For those with limited
budgets, Harbor Freight now seems to have close copies which may be
worth looking at. The brass plugs are 65894 ($3 for 4), and brass
couplers 97463 ($9 for 4). There are also brass with steel inserts
that mention compatibility with V series, 97631 ($4 for 2).
The ubiquitous M-types that are so common are rated 40 CFM. The Milton
V are rated 74 CFM. Can't help wondering if one of the brilliant
engineers that lurk here could tell us how much free HP that
translates into. The change over does wonders for HVLP paint guns.