inch 12 cm diameter d 1 for array a 1 the diameter d 3 of array a 3 is about 2 inches 6 0 cm the respective holes of array a 1 are formed in the aforementioned beveled band 53 on the convex end 50 c and the holes of array a 3 are formed in the flat central portion 55 thus the sprays produced by the holes of the two arrays diverge from each other as they leave the nozzle as shown in fig9 b and 9c that threaded portion 62 of the nozzle that engages nipple 23 is offset from the nozzle axis a u2032 to allow for the drainage of any water remaining in the interior chamber of the nozzle after use here the total number of nozzle holes is forty two thus the throughput of nozzle n u2032 is more than twice that of nozzle n above again as in the case of nozzle n each hole in nozzle n u2032 has a diameter of between 0 030 and 0 040 inch in fig1 a and 10b another preferred nozzle n u2033 is shown this nozzle is similar to the nozzle shown in fig9 a the differences being that the inner circular array a 2 has a larger diameter d 2 preferably 3 inches than the diameter d 3 of array a 3 in the fig9 c nozzle and the holes of the two arrays are offset radially from each other to minimize the interaction of adjacent sprays as they leave the nozzle both arrays a 1 and a 2 are formed in the beveled band 53 in.