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Due to the maintenance, we will close our website on June/19 9:00-10:00 and June/23 0:00-0:30 JST.
All customers cannot shop on our website during the time. Thank you.
I think that it is a mistake that the outer diameter size notation (34 mm for HT20) of the page of item description is wrong. Since the HT tube has a wall thickness, for example HT 20 has an outer diameter of 36.5 for both elbow and socket.