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When 15 mm copper tubing is used to connect the solar heating station and tank, coupling 81675 for installation on the tank's solar heating connections and couplings 81680 and 81645 are used for connection to the solar heating station.

When solar heating tubing DN16 is used between the tank and solar heating station, use coupling 81682 for attaching to the tank's solar heating connections and coupling 81655 for connecting to the solar heating station.

Product ID  
81680 Cu15 - R15 int
81681 Cu15 - R20 int
81682 Cu22 - R20 int