Not sure but if you batch sparge and you fill the tun with lots of water its going to sit there slowly leaking out!
I have a smooth sided one, drilled a 20mm hole through it with a hole saw, put a tapered rubber bung in it and then put 3/8" copper tube through the bung. A hose clamp on the inside to attach the ezy hooker screen and a hoseclamp on the outside to attach the pvc tubing. Hey presto instant bulkhead fitting!!!!!!!!!!
I am just using a pair of small long nose vice grips on the pvc tube as a shutoff valve to regulate the outflow but would not mind one of those roller clamp type thingys for flexible tubing if I could find one? any suggestions
I'll try and put a pic in the gallery over the weekend