| 4 Bar Linkage Knee Joint for Knee Disarticulation, SS | 08809689804747 | Class I | |
| 4 Bar Linkage Knee Joint for Knee Disarticulation, Ti | 08809689804754 | Class I | |
| 4 Ear Connector, Al | 08809689803948 | Class I | |
| 4 Ear Connector for Pediatric | 08809689802354 | Class I | |
| 4 Ear Connector, SS | 08809689803955 | Class I | |
| 4 Ear Connector, Ti | 08809689803962 | Class I | |
| 4 Ear Connector with Receiver, Ti | 08809689804099 | Class I | |
| 4 Ear Connector w/o Pyramid Hole, Ti | 08809689803979 | Class I | |
| 4 Hole Adapter w/Pyramid, Al | 08809689803993 | Class I | |
| 4 Hole Adapter w/Pyramid, SS | 08809689804006 | Class I | |
| 4 Hole Adapter w/Pyramid, Ti | 08809689804013 | Class I | |
| 4 Hole Connector, Receiver, Al | 08809689804020 | Class I | |
| 4 Hole Connector, Receiver, SS | 08809689804037 | Class I | |
| 4 Hole Connector, Receiver, Ti | 08809689804044 | Class I | |
| 4 Hole Connector w/o Pyramid Hole, Ti | 08809689804051 | Class I | |
| 4 Hole Offset Plate | 08809689803795 | Class I | |
| 4 Hole Pyramid with Round Base, Ti | 08809689808455 | Class I | |
| 4 Hole Rotating Base, Al | 08800319601798 | Class I | |
| 4 Hole Rotating Base, SS | 08809689804068 | Class I | |
| 4 Hole Rotating Base, Ti | 08809689804075 | Class I | |
| 4 Hole Threaded Base Plate, Al | 08809689804198 | Class I | |
| 4 Hole Threaded Base Plate w/Center Hole, Al | 08809689804204 | Class I | |
| 4 Prong Angled Rotating Base, SS | 08809689804365 | Class I | |
| 4 Prong Rotating Base, Ti | 08809689804235 | Class I | |
| 4 Prong Rotating Base with Rotating Receiver, Ti | 08809689804105 | Class I | |
UDI Compass