Just measured it with a micrometer.....think it'a a 26.0mm fitting as the internal diameter is no bigger than 26.4 Can't see any markings on it that give the size.
@markyp started
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Just measured it with a micrometer.....think it'a a 26.0mm fitting as the internal diameter is no bigger than 26.4 Can't see any markings on it that give the size.