If they cover a 40Ft Dia. per your shown specs. Does that mean you should place your risers 20Ft apart?
Weathermatic - Whiz Head Rotary Sprinkler - 1973
1973 WHIZ HEAD ROTARY SPRINKLERIdeal for riser installations in planting areas1⁄2” (1,27 cm) female threaded inletMade of high-impact corrosion resistant plasticStainless steel bearing and large orifice nozzle
1973 WHIZ HEAD ROTARY SPRINKLERIdeal for riser installations in planting areas1⁄2” (1,27 cm) female threaded inletMade of high-impact corrosion resistant plasticStainless steel bearing and large orifice nozzle