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Ric-
I use the heat tape on my water well pressure switch tubing with no ill effects. The tubing is 1/4" plastic. I secure it with tie-wraps and then cover it with foam insulation. So far there have not been any signs of melting, been doing it for 6 winters. Instructions that came with it said the thermostat activates the strip at 38 degrees and it is important that the control be weatherproof.
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