Hi and thanks for writing. I own a 1977 Piper Seneca 2 and I'm up in the low, mid and high teens frequently. For the last 25 years I've used a SkyOx 4 place system. A 24 cubic foot aluminum cylinder did the trick for me for most of that time. Later on I switched to a 40 cubic foot steel cylinder and I can do many trips on one tank. I also use Oxymizer cannulas. website: www.skyox.com. There are several other excellent vendors as well. Aerox (www.AerOx.com), too. Contact them and you'll get the straight scoop on it.
Scott Sherer
Wright Brothers Master Pilot, FAA Commercial Pilot
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Scott Sherer
Wright Brothers Master Pilot, FAA Commercial Pilot