I noticed that my Alde fluid was just above minimum, so as a conscientious T@Bber I called Elsie at PV and ordered some. This is what she sent. The invoice says "ANTI-FREEZE - 55 gal BOILER".
I will follow up, but does anyone know - is this pure glycol, or has it already been diluted to the 60/40 mixture recommended by Alde? There are no labels or markings on the container. I will say that it was shipped speedily and packed very well.