On Thu, 15 Jan 2009 15:34:22 -0800 (PST), Reuben_D wrote:

How about wrapping the said pipe and its foam insulation in fine wire
mesh ?

Like chickenwire? Or did you have something else in mind?

Normal 25mm or even 12mm chicken wire would be to coarse. They'd nibble in
the holes and they can get through a 12mm holewith no difficulty what so
ever. Something with 5mm holes might do it.

--
Cheers
Dave.