Mike, that prefilter is from OUTERWEARS, and I have a thread on their products here on RCTECH, you can click this link to get to it and it tells you all about them. I think we setup a dealer in Australia, but I'd have to search for the name of that shop. Or you can PM or email me a email address for your local hobby shop and I can have a dealers application sent out. CHEERS!!
http://rctech.net/forum/showthread.php?t=131145