BS 341 (British Standard)
| INLET CONNECTION | CONNECTOR TYPE | CONNECTOR DESCRIPTION | GAS PROPERTIES | EXAMPLES OF GASES OR GAS MIXTURES |
| BS2 | BS 341 No. 2 | G 5/8" LH | Flammable | Acetylene |
| BS3 | BS 341 No. 3 | G 5/8" INT | Inert | Air, argon, neon, nitrogen |
| BS3 | BS 341 No. 3 | G 5/8" INT | Oxidiser | Oxygen |
| BS4 | BS 341 No. 4 | G 5/8" LH INT | Flammable | Acetylene, hydrogen |
| BS4 | BS 341 No. 4 | G 5/8" LH INT | Flammable | Carbon monoxide, methane, natural gas |
| BS6 | BS 341 No. 6 | G 5/8" | Toxic | Chlorine, hydrogen chloride |
| BS7 | BS 341 No. 7 | G 5/8" LH | Flammable refrigerants | Flammable refrigerants |
| BS8 | BS 341 No. 8 | W 0.860" x 14 TPI | Non-flammable | Carbon dioxide |
| BS10 | BS 341 No. 10 | G 1/2" | Toxic | Ammonia |
| BS12 | BS 341 No. 12 | G 1/2" | Toxic | Sulphur dioxide |
| BS13 | BS 341 No. 13 | W 11/16" – 20 TPI | Oxidiser | Nitrous oxide |
| BS14 | BS 341 No. 14 | G 3/8" | Toxic | Hydrogen cyanide, nitric oxide |
| BS15 | BS 341 No. 15 | G 3/8" LH | Toxic | Carbonyl sulphide, hydrogen sulphide |
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