standing

Hi all... TLDR: Any suggestions for brands who make a 4.5 or 6 gal hydronic expansion tank designed to sit on the floor? i.e. Air-valve not on the bottom, with appropriate stand/feet/legs I have a *very* small mechanical room with a lot going on. I have a 125,000 BTU/h combi-boiler " feeding...

Hopefully the picture attaches below. We’re trying to install a new water softener and the house was pre-plumbed for it. The water loop is obvious and not an issue but the drain line has me concerned. I blew into it and heard/felt it blow freely somewhere (there’s no outside drain end point...