The advantages on choosing“Zilio Industries flat expansion vessels” Z200 Hot-dip Galvanized carbon steelImproved Crimping SystemInner Shell does not rust creating potential problems to the boiler due to water dirtiness, Galvanized steel is the best protection against high PH waterPatented design SBR/ BUTYLE membrane respecting DIN4807 regulation; it prevents possible sticking to the water connectionNo pre-charge pressure losses due to the decay of membrane’s physical and chemical properties SBR/BUTYLE membrane thickness 2+0,2/-0Perfect shape of the membrane’s edges