There's three main concerns with using the plastic lines:
1) The proper installation of the fittings to the line (using the dedicated tool is best.)
2) Routing the lines far away from heat sources.
3) Not inducing a permanent bend by heating the tubing (i.e. the hot water trick.)
There are some connectors out there that are really nice but have not leaked down to the aftermarket yet. The parts used on the new GM cars have an o-ring on the sealing barb and a very good double security locking mechanism.
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