| Part Number | NSN | Part Name | |
|---|---|---|---|
| 4811931MIL SM | 4220-01-580-3509 | Immersible Bump Helmet | Quote |
| 4811931MIL MED | 4220-01-580-3853 | Immersible Bump Helmet | Quote |
| 4811931MIL LG | 4220-01-580-3856 | Immersible Bump Helmet | Quote |
| 4811931MIL XLG | 4220-01-580-3860 | Immersible Bump Helmet | Quote |
| 4811931MIL-L | 4220-01-617-2193 | Deep-sea Diver's Helmet | Quote |
| 4811931MIL-M | 4220-01-617-2195 | Deep-sea Diver's Helmet | Quote |