Air line 90 degree nipple Air line fittings 90° nipple in 3 mm and 5 mm thread to 1/16″ barb. Air line fittings 90 degree nipple 3 mm thread x 1/16″ barb 3 mm thread to 1/16" barb £ P.O.A 5 mm thread to 1/16" barb £ P.O.A