| B0440 | K0207 | HALE HAMILTON (VALVES) LIMITED |
| BS1806-261 | K7766 | BRITISH STANDARDS INSTITUTION |
| NA35181 | K0207 | HALE HAMILTON (VALVES) LIMITED |
| DEFSTAN02-337-261-MN80 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| NES 337-261-MN80 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| BSM48-261 | K7766 | BRITISH STANDARDS INSTITUTION |
| NES337 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| NES337-261-MN80-(N83B) | U6183 | PRECISION POLYMER ENGINEERING LIMITE |