100mm/4" Condensate Trap with Overflow

The only 100mm ducting that will 'fit' this thing is the cheap and nasty flexible ducting you can get.So, once aforementioned cheap and nasty has been pushed into this trap, guess what; the condensation trap gully has been covered so rendering the product totally and utterly USELESS!I had to adapt a rigid ducting connector with several wraps of rubber tape to make this thing useable.My advice; don't buy unless you're prepared to spend a lot of time adapting fittings to make it functional.