@[email protected] to Home Improvement • 1 year agoWhat is this on my apartment hydronic baseboard heater?sh.itjust.worksimagemessage-square9fedilinkarrow-up130arrow-down11
arrow-up129arrow-down1imageWhat is this on my apartment hydronic baseboard heater?sh.itjust.works@[email protected] to Home Improvement • 1 year agomessage-square9fedilink
It’ll pick up some copper oxidation on brass fittings.