300 Bar DIN Personal Air Filter Used to filter air between compressor & cylinders with 300 Bar EN-144 DIN type attachments. Minimises the risk of contamination from compressors and keeps O2 Cleaned cylinders in a clean serviceable condition. Quick and easy to maintain using our compact cartridge typePersonal Air Filter Service Kit – PAF KIT. Maximises cylinder life by simply avoiding any unwanted particles entering your cylinders . Can be used with Nitrox after O2 cleaning.