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| PartNumber | D38999/20WG75BB | D38999/20WG75BA | D38999/20WG75BC |
| Description | Circular MIL Spec Connector 4P SZ 21 WALL MNT | Circular MIL Spec Connector 4P RCPT SZ 21 SKT WL MNT | Circular MIL Spec Connector 4P SKT CRIMP WM Rcpt w/seal |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| RoHS | N | N | - |
| Number of Positions | 4 Position | 4 Position | - |
| Insert Arrangement | 21 - 75 | 21 - 75 | - |
| Contact Gender | Without Socket Contacts | Without Socket Contacts | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | Receptacles | - |
| Shell Size | 21 | 21 | - |
| Shell Style | Wall Mount | Wall Mount | - |
| Mounting Style | Panel | Panel | - |
| Termination Style | Crimp | Crimp | - |
| Current Rating | 46 A | 46 A | - |
| Contact Plating | Gold | Gold | - |
| Contact Material | Copper Alloy | Copper Alloy | - |
| Series | D38999 III | D38999 III | - |
| Mounting Angle | Straight | Straight | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | - |
| Shell Plating | Olive Drab Cadmium | Olive Drab Cadmium | - |
| Mating Style | Self Locking | Self Locking | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Qualification | EREL | EREL | - |
| Shell Material | Aluminum | Aluminum | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| Part # Aliases | 88-565837-ABJ | 88-565837-ABH | - |