12" Length With Measurement Adaptor is used for checking the chimney draught, flue temperature & combustion efficiency of the heating appliance.
Made from 304 Stainless Steel outer and 316 Stainless Steel inner. It is fully welded and has CE approval.
(Please note: We base all of our twin wall system on the internal diameter measurement)
Same day dispatch if ordered before 2pm
Download Building Regulations Document J (effective October 2010) below
(Right click link, then select "save file as..")