cuckoo flower wrote:

On Wed, 23 Jul 2003 07:11:44 +0000 (UTC), "a0000000000"
wrote:

yes, i am using plastic pipes & fittings, and all the pipes are in
black plastic conduit, with black plastic junction boxes (with plywood
lids) where joints and exit points are. All the stuff is Hep20.

will the conduit hold it's shape under the weight of the concrete
(maybe 4 inch thick); not sure about this


Doesn't matter as long as it doesn't totally collapse.

If that is a worry, use a stiffer (less water) mortar mix.