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Apparently when a pipe cracks, you can non-invasively install a permanent liner
molblog

Apparently when a pipe cracks, you can non-invasively install a permanent liner
Originally uploaded by molbl0g.

...which saves you digging up 100 yards of sidewalk. They install it
by getting it started and then pushing water through it to unfold it
down the length of the pipe, then heat it to 180• and then cool it
for six hours. It was a longer explanation... I love chatty workmen
with lots of technical detail!