I ordered it from http://www.DrsFosterSmith.com. They also
have a leaf basket (glad mine was free) The retrofit drain
is $39.99

This is what I have on my koi ponds, all pictured and diagrammed.
Click on *My Filter* ~ jan


See my ponds and filter design:
http://users.owt.com/jjspond/

~Keep 'em Wet!~
Tri-Cities WA Zone 7a
To e-mail see website