Originally Posted by 1idejim
irrigation valves use stainless steel metallic parts, ferro-magnetic locators won't work. Tresure locators which locate non-ferrous metals usually don't work do to the extremely small footprint of the parts and the depth/soils mass.
if you choose to a metal detector you fall into the "even a blinde pig gets a peach now and then" catagory. it's more lvck than not.
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Interesting. I still stand by my dowsing rods.