How wide is the U fitting?

The U fitting (where the sprinkler head attaches to Lawn Belt) will take any 1/2" npt head. The distance between the U fitting is 1 -3/4" wide - where your head screws down between) Just dbl check these dimensions so your head will fit into U fitting ok.

At each sprinkler head location you dig a a little deeper and wider V-shaped opening 9-10" down depending on the height of you head to accommodate the U or End Fittings.