The sump adaptor is stainless steel component used where a flat concrete surface is present to allow the connection of a connecting flue pipe to a pumice, concrete or clay flue.
The sump adapter is larger than the flue and is screwed and sealed in place around the very outer edge. This type of adaptor also allows for any condensate to be able to run back in to the appliance.
Maximum External Clay Pipe Diameter= 225mm
External Diameter of Adaptor = 290mm