At 05:53 PM 1/19/2010, mark drillock wrote:
>needs to be pliable enough to go half way through the hole but firm
>enough to stay put with no support other than itself. If the consistency
>of the material is too firm it may be a pita to install unless you drop
>the tank fully for access.

How about HDPE?  Softish, slicker'n snot, abrasive stuff should bury
itself...just noticed tonight my supermarket has started using solid
bars of it for the "next customer" dividers at checkout, which seems
like an awful waste to me but they should last forever I 'spose.

Yours,
David