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Ducting Y Branch Connecting 55mm to 55mm to 55mm. Uses For 55mm internal diameter ducting Additional outlet to an 55mm existing system. Efficient split the flow of warm air from your heater. Used on earlier Webasto heaters eg HL18/24/32 & Airtop 18/24/32 Suitable for some unbranded heaters, check required ducting diameters.