<p>The spray unit has a pipe (1) and nozzle (3) held by a ring-shaped adapter (6) made of a pliable plastics or similar material pressed into the opening (2) in the pipe wall so that one end projects inside the pipe where it is widened out by a nozzle module (3) inserted in the adapter and pressed tight against the pipe wall. Independent claim describes dismantling tool comprising a fork with two arms running parallel to each other but becoming taller towards the common connecting end. The fork is inserted to remove the worn nozzle or adapter for replacement.</p>
