I guess I don't understand this, or don't understand why it's important. The funny pipe allows you to put the sprinkler head somewhere other than directly above the main pipe. If it's a foot away - and buried - who cares if the pipe is parallel or perpendicular?It's a foot away from the pipe's T.BUT it's a foot away in the same trench - 3" or so from the pipe. Doesn't require more digging.If it's perpendicular, it means you have to have a trench just for that.
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