No ray the outside diameter of screwed copper is 16.5 mm compared to 15mm for regular copper iknow its only 1.5mm but have you tried filing down to get a fitting on someone previous to my visit i guess quite a few yeats back usd a 3/4 x15mm tap connector and solered it in it looked tight and it wasnt that that was leaking ha ha anyway there was 15 mm copper at both ends so added the heavy copper to my:19: scrap bins