... connecters for water purifier:Thread dimension: 55 ° taper pipe threadThread teeth:1/8:28, Effective length:9mm,Bottom diameter: 9.728mmThread ... teeth :1/4:19, Efective length:11mm, bottom diameter:3.157mmThread teeth:3/8:19, effective length ... : 12mm, bottom diameter:6.662mmThread teeth: 1/2:14, effective length:13.2mm, bottom diameter:20. ...