I installed a soft start on my A/C last weekend, but wasn't sure what this sealant stuff was. It was sort of stiff and not like Dicor/silicone/etc. I didn't replace it with anything for nw. Hopefully it's not too critical.


Looks like it could be Fireblock Foam.


What was the purpose of the sealant? Is it keeping water out?

Source: What is this sealant on A/C compressor cap called?

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