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Originally Posted by murray13
Well 18mm metric corresponds to a 5/8" 'barb' connection. Only having a 3/4" NPT MD30RZ myself I wasn't sure.
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not quite - 5/8" would be 15.875mm - 3/4" 19.05mm so it's quite a bit bigger than 5/8"... i imagine getting 1/2" ID over it wouldn't be too difficult given use of boiling water if neccessary....