billythekid
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if its buried you wont need to worry much about it freezing, lag the exposed bits at the ends or whatever.
I'd use copper all the way but theres nothing i know of to stop you running mdpe all the way, or running exposed in copper. If your gonna lag anything above ground it wont be exposed to the sun etc.
That fitting you mentioned goes inside your mdpe compression fitting as an insert to change from mdpe to copper.( i think, my screen is buggered here so i cant quite see it clearly)
Cant remember the depth, 400mm rings a bell but scruff or someone will correct me on that. I remember something about 6" below for frost protection but just cant think off hand the actual reg. (It is on the forum somewhere as has been asked before)
btk
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