Originally Posted by hadfield43
The one contradiction he had with you is that with these colder climates he wasn't as big on having so much pressurized PVC and limited the manifold boxes back down to 3. I am sure this is just a preference thing, but he said sometimes youre just better off spending just a little extra on poly runs than have a mess.
Put a master valve in. I would do that by default anyhow given the property size.