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I have 13 zones. I dont want to dig up each head
You could also use a 3/4" fpt X 3/4" mpt bushing. Each one will raise a head approximately 1". If you need to raise it more than that, screw two together. The nice thing about these is that you only have to dig down to the fitting the head is screwed onto, rather than digging a larger hole to accomodate the flexible swing pipe.
You could also use a 3/4" fpt X 3/4" mpt bushing.