The best material to use would be rubitex. It's the black insulation that's on HVAC suction lines. The minimum thickness now is .75" but I like to use the 1" or thicker(though allot of outfits are still putting .5 on their linesets). An HVAC supply store will sell you just one stick. It will take allot more heat than the regular open cell hard foam plumbing insulation and it's flexible. It is however more expensive.
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