For those not willing to splice or learn to splice, a double or rewoven figure eight knot will hold poly braid just fine. Here's a brief instruction: How To Tie A Double Figure Of Eight Knot (Made By You)
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For poly lines you can purchase a cheap device, I used to use discarded pens, a pointed plastic cylinder that you place an end into and then push it into the other line and weave it through, then repeat for the other line and it is a pretty good splice. N
Calling the plastic tube for doing poly rope splices a fid somehow seems to do a grave injustice to most fids!
It's called a "fid." Good word for scrabble and crossword puzzles, too.
Here is a simple trick I started doing many years ago.
Just run a piece of 1/4 inch braided steel cable tie wrapped to your floating 3/8 poly line that you run 100 ft behind your boat to your dive bouy.