1/ a hole saw in a power drill will cut through cinder block easy.
2/ any silicone will work to seal the hose into the hole.
3/ a little bit trickier. Is access to the sump area easy? if so just put a rubber bung in the end of the pipe. If not, and assuming the room decor will allow it, just make a small solid pipe with plastic or copper and fit a plumbing valve.
2/ any silicone will work to seal the hose into the hole.
3/ a little bit trickier. Is access to the sump area easy? if so just put a rubber bung in the end of the pipe. If not, and assuming the room decor will allow it, just make a small solid pipe with plastic or copper and fit a plumbing valve.