Training day and having fun. In this video firefighter Lydia Rivera (she looks like she is fighting, but no) after being instructed on the skill, demonstrates how to stop a leaking sprinkler head. The water pressure is about 50 psi (100 less than a real system) but serves the purpose for practicing the objective. This is a way of refreshing the "forgotten skill" or the simple ones. All you need are: 2 - 1"x1" wedge, 2 - rubber or leather mallets, a leaking sprinkler head; for this you only need someone with a little plumbing skill, 4" of 1/2" copper pipe, a 1/2" ball valve, an universal fitting (to attach a garden hose), a 1/2" female connector and a sprinkler head. Solder all the pieces and attach it to a solid structure. You are ready for training.
Prior to the field training a class on types of sprinkler heads was given, for refresher.