"Used this pipe to connect my 5" bathroom fan extractor to the exterior flap vent. Fit was perfect and being solid was easy to push through the wall. Price was very attractive when compared to the cost of flexible pipe."
"As mentioned in another review I can confirm this does not fit through a 5" cored hole. It appears to measure slightly more than 127mm in diameter. There seems to be 3 different sizes mentioned in the specification 120mm, 125 mm and 127mm and none of them seem to be accurate for any part of the duct.
If you core a bigger hole ie 6" it fits to 125 extractors and vent cowls perfectly!"