EX-30 AMTROL EXTROL TANK (11×15-1/2inch 4.4gallon) 5 year limited warranty June 30, 2026 No Comments AMTROL designed and patented the first EXTROL expansion tank in 1954, redefining hydronic heating systems. For five decades their unique, pre-pressurized, diaphragm design EXTROL has been the world's leading expansion… Read more
