I'm scheming up a way to mount a transducer on my Ascend 128T that's flush with the hull's bottom. Anyone out there use a 4x3" plumbing flange & cap?

Thanks, in advance, for your 2-cents.

I have seen several videos of folks installing the transducer in the storage compartment of a sot kayak, they all say it shoots thru the bottom plastic layer fine with no defect. I would at least test it before putting a hole in my yak. I don't have a fish finder in my yak yet but have been researching doin so for a while now.

I used this guys idea....i have a cuda as well. Had to modify a little to make it work, but looks really nice. Not sure if it will work for your yak but is a good concept.

http://headwatersfishing.blogspot.com/2013/02/home-made-jackson-cuda-scupper.html?m=1

I just made a thread about this same topic too, except with a Cuda 12. I'll keep checking here for solutions that might work for my kayak too.

I have a Tarpon 120 and used Humminbird's kayak mount.  Shoots through the plastic without any issues that I know of.

 

http://www.humminbird.com/Products/MHX-XMK/

wet mount with a pool noodle from inside. Shape the noodle hole or foam to fit the transducer, glue the noodle or foam block to the inside of the hull, fill the hole with water and push transducer in. No bubbles this way vs a glue in. Use Goop for the glue.

Thanks for the replies.  I'm leaning towards a temporary through-hull mount for now, until I figure out a nice way to have it exposed to the water.  When I get something together I'll be sure to post it.

A lot of guys use duct seal too which makes removal easier and moving it around a piece of cake.

I used duct seal in mine. Works great and as was said, its not permanent so there isn't any issues if you want to take it out. Only beef with that is that it takes a little time for the water temp to be accurate. Otherwise, DSI and everything works perfectly

I ended up with plan A: using a toilet flange from Home Depot with a 4" rubber cover to seal it on the inside.

 

I'm pleased with how it came out.

 

i guess now my kayak flushes?!?!?!