DISCAIR MEDIUM BULLE DIFFUSER The medium bubble air diffuser DISCAIR is the good combination between a simple concept and a quality manufacturing which gives a efficient and economic use: Membrane in EPDM. A non-return valve allows the membrane to work without any clogging risk, Connection ¾" NPT thread, Support base and fixing ring are made of ABS Diagonal distance between openings mm These specifications are given for information only and may vary according to the installation and type of application.