A slip-on nozzle, the Lechler Series 591 spray ball comes in sizes from 1/4 to 2 in., with output flow rates from 4gpm at 40psi up to 143gpm. Coverages include 360º, 180º up and 180º down.  The lowest-capacity model cleans small vessels approximately 30 in. in diameter; larger sizes can clean tanks up to 12 ft. in diameter. The spray ball is made of FDA-compliant stainless steel grade 316Ti.  
Lechler, Inc.; 800-777-2926; www.lechlerusa.com