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Message: <blockquote data-quote="Lazarus" data-source="post: 738630" data-attributes="member: 323322">Two thoughts:One: Oil floats on water, so if you get any water ingress either rising from the foundation/ground or whatever other means, it'll get trapped under the oilTwo: Dry Sand is likely to be hygroscopic and may absorb water from the foundation/groundPersonally, I think leaving it void isn't going to be a problem, subject to capping the top of the pole - and there isn't much wrong with your temporary method: I do the same on my oil tank filler!Edit: Just seen CH's reply - like the foam idea :-thumb1</blockquote>