1. Item: Nut rotatable coupling (press fitting); 2. SS304,316; 3. Easy install; 4. ... and DN100, including GB 1 and GB 2.GB 1 series is same size as DVGW W534:1995, out diameters are ... , 35, 42, 54, 76.1, 88.9, 108mm.GB 2 series is same size as JIS G 3448-1997, out diameters ... this link: http://www.hwsspfp.com/en/download.asp Nut rotatable coupling