According to THIS
https://applied-inc.com/oxygen-cylinder-sizes-and-info chart, 5.3 lb.
(Aluminum, medical)

THIS
https://www.exmed.net/p-3771-responsive-respiratory-d-oxygen-cylinder.aspx
says 5 lb. (Aluminum, medical)

But THIS
https://www.amazon.com/Steel-Oxygen-Cylinder-CGA540-Valve/dp/B01E2TS1TQ
is more likely what you're looking for, and it's 16 lbs.Â* (Steel)

On 5/27/2018 8:17 AM, Jonathan St. Cloud wrote:
Was wondering if anyone knew the approximate weight of tehnD size steel 02cylinders that are used in Schliecher gliders? Thanks

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Dan, 5J