No. Valve boxes are for marking a location and looking in, not for working in. In most cases the only valve box you will get into on a regular basis is the main stop box to winterize. Sprinkler systems are very reliable, you may never open the valve box lids again. But if you do need to get in to make a repair, you will need to remove the valve box and dig a big hole to work in. If you need to repair a leak you may need to cut it out. In that case you don't want a bunch of other valves and pipes close coupled to the one you want to remove. I do not recommend manifolds for that very reason. Give yourself plenty of space between valves. It is cheaper, more convenient to repair and visually more pleasing to have three 6" valve boxes in a row a foot or more apart than one 12" standard box.
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