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its more common to bury PVC in the US than here from what I have seen. You can, but joints are more effort and less forgiving in movement than hose. This in either 25mm or 30mm is ideal, and then easy to get connectors to the pop ups. Much like flow profiling, pressure and flow are related and depend on the pipe. You also need to measure how much flow you have as the sprinkler heads are rated by flow. Not enough and you can only run one at a time, which just means more zones and more pipes back to the controller, rather than plumbing them in on the same pipe.