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| 50-143 | U2164 | JAMES WALKER & CO LTD |
| B05300 | C7580 | JA-GASTECHNOLOGY GMBH |
| BO5300 | C7580 | JA-GASTECHNOLOGY GMBH |
| B05300 | K0207 | HALE HAMILTON (VALVES) LIMITED |
| 50-143 | U8616 | JAMES WALKER & CO LTD |
| BO5300 | K0207 | HALE HAMILTON (VALVES) LIMITED |
| BS1806-143 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-143 | K7766 | BRITISH STANDARDS INSTITUTION |