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Rubber F-connector from Alde.
Alde rubber connectors are made from ø21.4 mm EPDM rubber, tested and used in central heating systems for over a decade. Compatible with the 22 mm aluminium heating circuit, tube can be fitted to the rubber by hand. Always ensure there is at least 3 cm of tube inside the rubber connector, and a fitted spring clip, for the heating ciruit to be watertight.