| 224 | K7766 | BRITISH STANDARDS INSTITUTION |
| BO3219 | K0207 | HALE HAMILTON (VALVES) LIMITED |
| DEFSTAN02-337-224-MN80 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| NES 337 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| BS1806-224 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-224 | K7766 | BRITISH STANDARDS INSTITUTION |
| STD-14/1 | K1213 | CONCENTRIC CONTROLS LTD |
| NES 337-1984 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| NES 337-224-MN80 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| NES337-224-MN80-(N83B) | L6427 | MOBILE VALVE REPAIRS |
| NES337-224-MN80-(N83B) | U6183 | PRECISION POLYMER ENGINEERING LIMITE |