18 Litre - Heating Expansion Vessel Tank with Replaceable Membrane 3/4" Connection - XVES 100 020 -Vertical expansion vessel for sealed heating systems-Suitable for use within heating systems -Epoxy Coated Steel Container-Vertical expansion vessel -Replaceable EPDM Membrane-Red coloured shell -Pressure pre-set to 1.0 bar-Top or Bottom 3/4" connection (Depends on installation) NOTE: This expansion vessel is NOT suitable for Potable applica