Ferno-FWESX Inx Sx, Surface Extender Pair, EACHInx Sx, Surface Extender Pair The SX Surface Xtender gives a greater feeling of comfort and stability to patients and reduces the likelihood of operator injuries that can occur when handling larger patients. The SX Surface Xtender widens the cot surface of the POWER X1 Ambulance Cot and the iNX Integrated Patient Transport & Loading System by 38%. 220 lb load capacity per wing. Compatible with: POWERX POWER X1 Ambulance Cot iNX Integrated Patient