This Air Admittance Valve (AAV) is designed to automatically release trapped air from the wet side of your hybrid system. The valve is supplied with a 15mm compression end for copper tube. Or if you're fitting onto barrier pipe, the nut and olive can be removed (leaving a 1/2" male thread for an iron tee with a 1/2" female thread).
More info and resources
Installation guidance is one AAV per fan coil unit, at the highest point of the pipework. To make sure you follow the correct system installation procedures, head over to our specialist Hybrid Hub. You'll find loads of technical and training resources, plus pretty much everything you need to know about Hybrid and Pressfit: www.pressfitsolutions.com