Nathan,

I had a peg tube inserted prior to treatment starting. While I have not yet had to use it, knock on wood, my cap also leaked periodically. My cap is plastic, flat with a ball seal. My radiation nurse, when questioned about the leakage, said it was common due to sneezing and/or coughing. She suggest a spring clip type paper clip or a mini potato chip bag clip. Bend the tube and attach the clip. I did this and my improvised backflow preventer has stopped the leakage. Ask before trying this, as tubes are of different designs.

Pete60