Compressors are they worth it?

[Someone-Else]

It's called covering their bum. The problem is as I said, often people will use an extension lead which itself has cable that is too thin for task in hand. So it is easier to say use a longer hose. I understand that to most folk all extension leads are the same, but they are not.

Put it this way, if what I said is not true, how does a compressor (yours, mine, Tom, d*ck or Dave's) work and not burn out, it still runs on electricity that comes down a cable. The answer is it's the diameter of that cable.

[Job and Knock]

Can't comment on quality, but there are two sizes of "connector fittings" (small and big)

In point of fact there are a lot more than two styles - with types like Scrader, CEJN, etc there are several dozens. The second of those two examples is the venerable PCL "classic" which appeared before WWII. A bit old hat these days because if restricted airflow and a tendency to blow off (self disconnect) when they get old and worn. I'd avoid them. The first is the PCL XF type, more commonly known as the Euro quick connector. Pretty much every msnufacturer has a version of this e.g. CEJN 320. These are a far better design with better air flow (because of a bigger bore) and a much reduced tendency to self-disconnect

[ahfix]

I finally got a set of connectors and set up my nail gun. I had the hose connected to the left hand side, when I turn the knob in the centre the pressure valve on the left goes up - OK.

However the pressure valve on the right keeps creeping up and gets up to the red line at which point I panic and turn the compressor off. What's going on here?

ah

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[Someone-Else]

Only a guess, but the left meter is the "line pressure" (The pressure that is going down the air line) and the other meter is the tank pressure. It will (should) stop as soon as it gets to its set pressure.