You are very close!!! I used 1 1/4" pipe. The smallest connection in my entire system is 1" which is what the internal diameter ends up being when you join 1 1/4" pipe!.
Also the valves I used are not traditional "Up and Over" sprinkler valves. I use Irritrol 700 series. My system from two years ago used 3/4" valves that were about $25 each, this year I upgraded to 1" at $45 each.
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15 Mondo Surf Edition
02 LSV - Traded In