Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3328077.

I wanted something to help seal the connection between my extension cords for Christmas lights and couldn't find anything to do it, so I designed this.

Later I found these things which do the same thing, but you have to pay for them: http://www.rainblock.net/

Printed with flexible filament of course, and they work great for me! (I Make no warranty to their actual effectiveness)