How to install a new pvc line on a fridge to an existing small plastic line

Watts claims their Ander-Lign fitting is universal and specifically says it can be used with plastic tubing carrying water.

The fact that they are using an insert makes the fitting stronger than the usual water filter/frig water supply fittings which are simple "push in" type fittings.

Here's an example of the other style: http://www.freedrinkingwater.com/parts/fittings/jg-whitepoly-male-connector.htm

I think you should be fine.

(1) Turn off water to ice maker. If it still drips you have a blocked drain line. Drain line carries condensate from freezer coil to a pan in bottom of the fridge where heat from motor causes it to evaporate.

Exact directions for unblocking drain line will depend on your specific model fridge which you have not included in the question.

Generally (2) unplug power. (3) remove coil cover in back of freezer. There will be ice in the tray under the coil. Allow it to melt or speed up the process with a hair dryer.

Once you can see where the hole is that carries water to the bottom pan you will (4) clear the line with a blast of compressed air.

(5) Allow all ice build up in coil to melt using towels to soak up water,keeping too much from over filling bottom pan.

(6) Re install freezer coil cover and power back on.

Of course if your leak stops after step one there is a problem with ice maker supply line.