Should the suction control stopcock be turned off for gravity drainage or for patient transport?
No. The suction control stopcock should always remain in the on position when connected to the patient. If the stopcock is turned off though, the patient is still protected two ways; first by the one-way valve created by the water seal, and second, by the integral positive pressure valve. Both the water seal and the positive pressure valve provide maximum patient protection when either the suction line or stopcock remain open or closed. It is not necessary to turn off the stopcock, clamp, or cap the suction line during gravity drainage or patient transport.
