Truma Blown Air Heater End Outlet - Back Nut

These back nuts are needed to secure the air outlets to the Truma 65mm ducting, used with the Truma range of air heaters.

Please note:  if you are using an LT Tee piece, to connect to the ducting, you will not need one of these back nuts.

Also if you have the black outlet, you still use these grey back nuts.