Oxygen concentrator Philips Respironics EverFlo for sale. Original Philips 5-liter oxygen concentrator for sale. Comes with complete factory documentation: the original user manual and the official EU declaration of conformity. Condition: works perfectly. 2–3 minutes after switching on, the green indicator lights up on the OPI system, which ensures a clean, high-concentration oxygen supply. Filters: brand-new, top-quality German filters are installed. Hours run: 18,074. Price: 1,000 GEL.