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150mm to 100mm Metal Ducting Short Concentric Reducer. Male spigots will slip inside female sockets or spiral duct pipe. A female coupling will be required to join two male fittings. Can be used with the extensive range of i-sells metal ducting connectors and fittings. Fittings should be secured using the appropriate fixing method such as sealants or tapes. Our fittings are produced in accordance with DW144 and have a rolled edge making handling safer, and improving alignment.