Type A: it is Yang side inside the wire connector, and female head fast connection, side and outside of pipe
B: it's cloudy outside the wire connector, also known as the female head outside the wire fast connection, one side is with two card male head of the groove and on the other side and inner wire pipe connection
C: is female hose connector, also called Yin side tube fittings, female head hose connection, Yin pagoda joint, is used for and hoses, hose, hose, pipe, quick joint of tubing
D: it's cloudy in the end wire fast connection, also called mother silk in the head quick release coupling, male head, side joint on one side is the internal thread interface
E: is the hose connector, Yang side tube fittings, Yang tower, while female head, take a hose;
Filament type F, is outside the Yang side of joints, the male head outside the wire fast connection, male head on one side, one side is male, F type can be combined and flange welding is used, the F type flanged joint quickly, is also very extensive use.
DC: Yin the fast plug, namely female head quickly, also called fast plug rod type, Yin dust cover.
DP model: it is Yang fast plug, also called fast plug, male head head quickly, also called Yang the dust cover
Source： http://www.kg-machinery.com//news/classification-of-aluminum-camlock-coupling.html
