The PureFill™ Oxygen System is designed to provide an unlimited oxygen source for patients to refill portable oxygen cylinders themselves. The PureFill™ is compatible with any oxygen concentrator with a transfill port that also produces greater than 90% oxygen. The PureFill™ is available with the Pure Oxygen Concentrator, CGA 870 post valve cylinders with transfill ports, and cylinders integrated with the market-leading Bonsai® Velocity pneumatic conserver. Designed to seamlessly integrate with the Pure Oxygen Concentrator, the PureFill™ is available with a footplate adapter and caster extension kit. (Sold Separately) Patients may use up to 3 LPM from their concentrator while the PureFill™ is in operation. Average fill time is about 52 minutes for an M4 cylinder, about 80 minutes for an M6, about 124 minutes for an M9 and about 5 hours for a D cylinder.