Carbolite 103 isn't equivalent to 531 - its nearest equivalent is Raleighs' '18-23'...if you were being cruel you'd call it 'gas pipe'.
@Dave_Cobblemonster started
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Carbolite 103 isn't equivalent to 531 - its nearest equivalent is Raleighs' '18-23'...if you were being cruel you'd call it 'gas pipe'.