There is a thread running lower on this page
"I just do not get it...why?" It deals with methods you might be interested in.
Here's the one I use and posted on the above thread:
I use a 50 quart rectangular cooler with a stainless steel wire BBQ grill fitted to the bottom. The grill fills the bottom to all the edges and is raised (a little bending and adjustment was needed) about 1/4 of an inch from the bottom. It was bent so that it just rides above the drain on the one side.. A quick change from the regular spigot to a CPVC valve and I'm set to go.
I fit a wet Walmart VOILE curtain panel into the cooler ( it sticks to the sides and rides on the grill easily if it is wet to start) then I secure it to the outer edge of the cooler.
Easily handles all my 6 gallon all grain bills, keeps the temperature where I want it, drains as fast as I want it to, never gets stuck and leaves me with a well drained and not too heavy curtain full of spent grain..