I’m looking for 6 metres of 75mm hot air heater ducting, plus a 75m Y piece with a shut off valve to close one leg of my ducting set up. I need to be able to manually open and close the ducting flap valve.

You will find the 75mm duct at https://www.butlertechnik.com/item/Eberspacher/or-Webasto-heater-Air-Ducting-75mm-ID-CUT-TO-LENGTH-102114340000-292100010025-Meter-Lengths/5JN. If you order 6 x 1 metre you will receive one uncut 6 metre length. Uncut lengths up to 20 metres are available.

There isn't a 75mm ducting flap valve available. The option is to use 90mm to 75mm ducting reducers with a 90mm duct flap valve.

We also recommend using a flap valve operating bowden cable to operate the ducting flap valve to cLose off one leg of your ducting.

Alternatively, if you want to shut down one leg of your ducting you could install a 75mm closeable outlet with a 75mm ducting flange.

NOTE: It is important that you always have at least one duct air outlet open when operating the heater to avoid overheating issues.

The above ducting parts are suitable for both Eberspacher and Webasto heating systems.