Mixer niche made of UV-resistant ABS with watertight ASA cover. Flush mounting.Easy and innovative installation thanks to the new fixing system with self-locking side wings. There will be no more need to drill the side holes for screw fixing. In fact, thanks to the two A4 TORX steel screws built into the sides of the enclosure,you will only need to screw those in and the fins will automatically lock against the back of the bulkhead. Installation quindirequires only a Ø mm. 70 hole. Assembly video link --> https://www.youtube.com/watch?v=A-dfA-KW58I&feature=youtu.be (to see the link copy and paste it into a new browser window)