Ecocal A rated reversible thermostatic radiator valve. Our renowned Ecocal thermostatic radiator valves meet the latest European standards including TELL 'I' rating. Ecocal TRV's are particularly ideal for use in conventional twin pipe heating systems where the level of temperature control needs to be more accurate than is available through a manually operated valve. Features & Benefits: Carefully manufactured for either retrofit or new installations and have a reversible body for either horizontal or vertical fitting. Suitable for either on-flow or return pipework, these TRVs provide the installer with flexibility. Liquid filled. Connection Shape: Angled Connection Size: 15mm