Medical Cannula with EDS

A previous RAS topic asked about adapting cheaper medical cannulas to the Mountain High EDS units. I posted a reply suggesting it was a "penny wise, pound foolish" solution. But, in the interest of investigation, I purchased (too many) cannulas from Amazon, following a link recommended in the original thread. Adaptation to the EDS was simple, only requiring a 2 inch piece of 6 mm poly tubing plugged into the receptacle at the end of the cannula tubing. In addition, the medical cannula had soft and flexible tubing that was very comfortable.

However, the first thing I discovered was, as soon as oxygen began flowing, there was an extremely noticeable "chemical" or plastic odor. I figured that it would eventually dissipate, and I ignored it. But after three flights, the odor is still there, and I realized that my performance on the last three flights was substandard- my thermalling was not as efficient, my decisions were haphazard and my general flying was degraded substantially. And I landed with a headache. I flew for over three hours today, reaching altitudes above 16,500 ft. MSL and my headache has not abated.

I am throwing the entire batch in the dumpster and going back to the Mountain High cannula.

YMMV