Constant Flow series is our most economical single and multi-place, portable oxygen system for general aviation. Weight is kept to a minimum by low profile, light weight regulators, MH-3 or MH-4 Flowmeters and Cylinders. The XCP System can be used up to 25,000 ft. with the MH-4 Flowmeter and Facemask. Choose the MH-3 Flowmeter for flights up to 18,000 ft. XCR systems come with a control-holster so you can turn supply on and off more conveniently. Full Pack Kits contain the following > Flow Control unit and instructions (XCR only) > Oxygen Cylinder & Regulator > Cylinder protective bag and seat back mounting. > Oxyimiser Cannulas and carry bag > Face mask  > All tubing required > Flow meters (your choice of MH3 or MH4) We can put together a system for you that best suits your aircraft and requirements. The things you need to consider is the space you have available to store your cylinder, the altitudes you think you maybe flying at, the number people who will be using the system and consider how you will refill your oxygen bottle. Oxygen Cylinders - there is a variety of sizes of cylinders, the bigger cylinder the longer the breathing duration. Click here to see our cylinder chart which includes cylinder dimensions and durations. Please don't hesitate to contact Al Sim on 0405 497 595 or click here to send an email to discuss your requirements. He will put together a Full Pack that best suits your requirements.