luckily i install medical and industrial gas systems for a living and the perks are you get loads of odds
and sods.regulators/pipes/stainless fittings/pnematic hoses/fittings ect ect.
the top tank i took outa a hospital and figured it would make a nice addition to my own compressor underneath.
being medical it has loads of filters to take out the moisture so i have nice dry air outa my system.
garage has various wall air outlets.