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By certification 
Item: Plastic check valve
Type: Spring
Port size: 1/4 inch
Body material: PA66
Inner material: Viton
Opening pressure: <=2Kpa(common)
Back pressure: >=100 Kpa
Type: Spring
Port size: 1/4 inch
Body material: PA66
Inner material: Viton
Opening pressure: <=2Kpa(common)
Back pressure: >=100 Kpa
