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Old 8th July 2013, 01:26 PM
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Ceathreamhnan Ceathreamhnan is offline
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Join Date: Nov 2011
Member of: Dunfermline
Location: Stirling
Posts: 637

I've managed to answer my own question; they are ISO 7241-1 Series B 'Interchange' couplings - interchange because they can be made by any manufacturer and will work with others complying with the ISO standard.
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