Eplace them. see, To replace the wash housing check valves – Bio-Rad ChromLab™ Software User Manual
Page 175
System and Sample Pumps
Instrument Guide
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To replace the wash housing check valves
1.
Identify the left and right wash housings.
The wash system has two wash housings for each pump. The left housing
has check valves connected at the inlet and outlet ports. It is installed on
the pump with the arrow (flow direction) pointing up.
The right wash housing has empty fittings connected at the inlet and outlet
ports. The right housing is installed with the arrow (flow direction) pointing
down.
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