birds nest

[martinw58]

this will keep the compressor warm

[moondawn]

bet your glad it was not a bee hive

[Brian_UK]

Perfect picture, when I read your thread title my first thought was IMI/Qualitair/Marstair.

Wasn't far out I think; often found then tucked up around the crankcase heaters.

[Latte]

Though it was a new energy saving measure to save having to use a crankcase heater