This duotight 8mm(5/16") adaptor is designed to suit the  and will allow couple your Nukatap mini to a wide range of other 8mm(5/16") duotight fittings or alternatively be able to attach to the .  This particular type of includes a "tang" at the top of the push in fitting that couples with this adaptor.  The combination of the two fittings prevents the tap spinning around while in use. 

Other Parts Sold Separately