Maybe he can learn from my experience -- I found my PEG worked best when I was sitting, rather than standing, so I would sit in a rocker in front of the TV while slowly pouring the junk down the tube. What annoyed me the most about the process was the time it took to get it done.

Right near the end, I noticed that I could push the tube in and out of the ring in my chest (confirmed that after the Doc removed it -- there is a bulge on the end to keep it from pulling all the way out of the ring without exerting some effort).

I surmise that when standing, the end of the tube was being partially obstructed and it was open while sitting; based on what I discovered too late to use, likely I could have been maneuvering the tube to get a good flow...