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Open tote tool bag is the best for power tools, wrenches, screwdrivers etc. There will be holes in whatever backpack you're going to use.

I like old school Pump/Down. Pressurized liquid line. High pressures during summer but nothing to worry about. High starting torq compressor.

$0.01 leak detector instead of $20.

Pressure switch or compressor's oil pump is broken if there's enough oil in the sharing line and all the other lines are shared too.

It's already shitty installation if customer doesn't care, use silicon for cool temps for insulation. Roll some masking tape to prevent silicon spreading and use your finger to spread silicon in to...

You have to think about compressor cooling with these. Less superheat is better for the compressor.

Not necessary if you're lazy and you have a scent about the leaking part I.E hole in the condenser coil.

Your brain chemistry will get messed up and you need sick leave and antipsychotics. Don't get burnt.

I'd buy one.

Returning to my former employer or landing a job in plant maintenance and industrial services as mech installer pvvt! pvvt!