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Webasto air outlet backing nut 60mm. Use with 60mm outlet For 60mm internal diameter ducting 45 degree angled louvre For initial installation Additional outlet to an existing system Suitable where screw fixing is undesired for 60mm outlets Item is coloured black as shown Use with Webasto, Eberspacher & Propex heaters Use with 60mm air outlet backing nut where drilling holes is not preferred.