* For device series BPT E 12/18/24/30 H, please
check whether retaining tube 386580 and O-ring
365428 are also required.

* For device series BPT 820/1020/1220 EB, please
check whether retaining tube 365259 and O-ring
365428 are also required.

* The retaining tube and ventilation flap must be
glued together. We recommend using adhesive 150012.
The installation instructions can be found in the
webshop or by contacting our technical customer
service.