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👉 Check Latest PriceThe 3-way coupling piece can be screwed on top of a water pump's delivery connection, and is suitable to connect the following items: * Water pump * Expansion vessel * Hose / tube to the draw-off points The bottom of the 3-way coupling has a 1" screw coupling with a male (external) thread that can be connected to the water pump. The 1" screw couplings with a female (internal) thread on the top and on the side are used to connect it to the expansion vessel and to a hose / pipe that leads to the draw-off points.