Valve Kit for AR303/D303 AR North America pump 
The kit Includes a full set of check valve assemblies and the o-rings for the seat of the valve. If your pump is not drawing water or the flow is irregular your valves may need to be replaced. If your pump is in constant use, we recommend changing these parts out every 3 months or 500 hours of operation.
Includes: 
Qty 6 Check Valve Assembly Ref# 50
Qty 6  O-Ring Ref # 51