Abstract: Ice rink refrigeration apparatus includes a liquid refrigerant supply pipe; rink pipes which receive this refrigerant and extend beneath the ice rink to effect cooling and a collection pipe which collects the vaporized or partially vaporized refrigerant from the rink pipes. The supply pipe is mounted coaxially within the collection pipe to form a common header which is positioned centrally of the rink. A unified connector piece serves to connect the two ends of each rink pipe with the supply and collector pipes respectively.