http://www.bigwatersedge.com/bwevb/s...?t=6394&page=5
take a look at this link. this is what i did for my wet mount. i used a container that i had bought lunch meat in from target and just cut out the bottom.
this has worked great for me. it holds the water tight with the lid and also the temp reading has been fairly accurate.
make sure to use a piece of foam to keep the transponder in place in the container. if you don't the transponder moves around and the reading will be off. i made this mistake so learn from me.