Yes i'm new here, i am a building service engineer of 20 odd years, before that i did installation of real AC when real pips was used, 1 1/8 suction lines not the hollowed out wire used on the new AC system.
Ok i have not moved on with the times and there are many good things now.
It was the happiest time of my life doing installs for big computer suits running 36 circuits of pipe work. Alas those days are gone.