| 1L220 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| 5-709588-1 | U0834 | VOKES AIR FILTERS LTD |
| SSML7-17 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| SSML7-17-1L220 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| BS1806-220 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-220 | K7766 | BRITISH STANDARDS INSTITUTION |