On Thu, 27 Aug 2009 06:02:08 -0700 (PDT), Shaun Eli
wrote:

I have an outdoor drain set in the concrete outside the entrance to my
basement. The water table around here seems to be rising, so when we
get an extremely heavy rain water backs up from the drain (it's not
coming from the rain falling down, it's coming up from the ground).

Anybody ever use these? Do they work okay or might they leak under
pressure?
This is what worked for me:
I got the expandable rubber test plug that plumbers use when they have
to test things like drains in tiled showers, etc. At H.D it's called
test plug, wing nut, and comes in various sizes. Find the right size,
remove the drain cover, insert plug, tighten wing nut. Since my drain
is only used to drain the Water heater, an/or boiler periodically, it
works great for me, as I leave it permanently installed.
http://www.newmantools.com/cob/alum.htm
HTH
starrin