Reducing cone used to step down or up in hose size and used for connecting to machinery with different sized outlets.
It is recommended that 100mm diameter hose is always used from the dust extractor to the dust producing machine and then the reducing cone fitted.
Using any length of hose of less than 100mm diameter will reduce the performance of the extractor and should therefore be kept to a minimum. A 100mm hose clamp should be used to fasten the hose the reducer.
From: Outside diameter 100mm, Inside diameter 93mm
To: Outside diameter 38mm, Inside diameter 35mm
The 100 to 38mm reducer is actually made up of 2 pieces. 100/58RC and 61/38RC which fit together to give 100 to 38mm.