Similar for urinal pipe tests on the C-130.
1) Blank off external end (underside near ramp).
2) Pour honk bag of water down front urinal disconect and then pressurise with pump.
3) Ask new rigger to go under aircraft on crawler board and remove blank.
4) Wait for shouts and hear knocking on underside (head hitting bottom of A/C in attempt to escape pressurised 5 day old p*ss hosing.