Original vector leads from Physio-Control used in conjunction with the Physio-Control Lifepak 12/15 12-Lead ECG Cable with Pre-Attached Limb Leads – 11111-000018 to create a 12-lead ECG cable. Physio-Control has moved to this style of ECG cable for the Physio-Control Lifepak 12 and Physio-Control Lifepak 15 to give users easier cable management, troubleshooting, and replacement.