I'm quite confused by the couplers for air hoses, tools and
compressors. The compressor that I am going to buy has a 1/4" outlet.
The hose I bought is a 3/8" and the tools that I bought have a 1/4"
inlet although they recommend a 3/8" hose. What type of connectors do
I need? When I see a 1/4" or a 3/8" coupler does that mean the hose
side, the connector side, or both sides? What size do I need for my
setup? Do I have to buy a special 1/4" to 3/8" adapter?

My other question is about water traps and oilers. I've read that it's
best to place them as close to the tool as possible. However, the ones
that I have seen on HF and NorthernTool look quite large and heavy and
look like they are supposed to attach directly to the air compressor
outlet and not dangle from the end of the tool. Are there lightweight
ones that easily attach to the tool itself? Any recommendations on
where I can find one and a good brand? Thanks,

Brett