1" pipes in each zone. Yeah it seems backwards to go larger downstream, as you won't get any more volume than the 3/4" line will produce. Pressure won't change using large pies downstream either. Just a preference. Thanks for the kind word, just had it blown out for the season yesterday.
Joel, so you have a 3/4" water mainline from your house to feed into a 1" manifold? Are the pipes for each zone 3/4" or 1"? Great job by the way.
1" pipes in each zone. Yeah it seems backwards to go larger downstream, as you won't get any more volume than the 3/4" line will produce. Pressure won't change using large pies downstream either. Just a preference. Thanks for the kind word, just had it blown out for the season yesterday.