A new sprinkler system installation uses 1" PVC Schedule 40 mainline, but the backflow preventer (PVB) and pressure regulator are 3/4". The user asks if reducer fittings are acceptable.
Keep the 1" PVC mainline and reduce at the backflow preventer. This maintains better flow volume. With 82 psi static pressure, a pressure regulator may be unnecessary—it's typically only needed above 90 psi. The 1" line throughout the system is the right choice for 9-12 GPM demand.
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