[BarryB]

If you have the pipe, but no fish line, easy. Either use an electrician's fish tape to push through and attach your wires to pull through, or, use some weed wacker line. When I pulled the transducer through the tunnel (not the pipe), I pulled two weed wacker lines. One to use to pull the transducer cable with the big connector and one to keep in the tunnel for the future (the orange colored line in the photo).