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| BS1806-220 | K7766 | BRITISH STANDARDS INSTITUTION |
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| NB27378 ITEM 29 | K0207 | HALE HAMILTON (VALVES) LIMITED |
| DEFSTAN02-337-220-MN80 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
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| NES 337-1984 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| NES 337-220-MN80 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
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