Hi

I've recently plumbed a new washing machine into the garage and need
to run the outflow pipe through the garage wall foundations, into a
trench, then run it along for about three feet before connecting it
into the the drain where one of the downpipes flows from the guttering
in the house. My problem is that I'm not sure how I can drill a core
into the concrete gully to fit the outflow pipe without cracking the
gully. I'm also not too sure how to get though the garage wall.

Any advice?

Cheers

Ben