I did find the Irwin site and the power press clamps were made by them. They are no longer being manufactured as "Power Press" but now as "Quick-Grip but with same feature (adjusting either clamp bracket along the entire length of the pipe-no need for threaded pipe) Here is the link to the page on their site. http://www.irwin.com/irwin/consumer/jhtml/detail.jhtml?prodId=IrwinProd100032
and a link to the Online dealers page, sorry no Australian dealers though.
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