Short Pitch			Long Pitch
Stage 1	Stage 2	Stage 4	Stage 1
C12A	C012	C014	C12K
C13A	C12B	C14D	C13K
C1XA	C13B	C15D	C1XK
C14A	C1KB	C16D	C14K
C15A	C14B	C17D	C15K
C16A	C15B	C18D	C16K
C17A	C16B	C19D	C17K
C18A	C17B	C1AD	C18K
C19A	C18B		C19K
C1AA	C19B		C1AK
	C1AB

The coupling rod is the connecting part between the rotor and the driving shaft.the two ends are respectively inlaid with alloy bushing
to increase the wear reistance and prolong the service life of the pump,and there are a variety of types and materials to choose from.