4 pvc check valve backflow

{"title":"Stainless Steel 316 Flange Swing Check Valve DN25 CL300 RF CF3M","imgUrl":"https:\/\/img.chinax.com\/nimg\/e3\/e4\/6afda976b7cbf3c0d769f02d2868-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"TOBO","Model Number":"CF3M","Minimum Order Quantity":"1Pcs","Delivery Time":"10 working days","Certification":"ISO 9001\/ API 6D","Place of Origin":"China","Payment Terms":"L\/C, T\/T, Western Union","Supply Ability":"10000 Pcs Per Month","Packaging Details":"Usually packing by plywood case suit for sea delivery","Product Name":"Flange Swing Check Valve","Material":"CF3M","Application":"Oil, Gas, Water, Steam Etc","Advantage":"Quiet","Temperature":"-10~80 \u2103","Design":"Wafer","Connection":"Flange end","Body":"Stainless Steel"}}

{"title":"GF 369 Plate Check Valve PVC-U\/EPDM PN6 DN90 Non-Spring Design \u2013 Industrial Backflow Prevention Solution for Corrosive Media","imgUrl":"https:\/\/img.chinax.com\/nimg\/c0\/ac\/61a6afeb397cb8abc6c46afd6a35-200x200-1.jpg","attrs":{"Price":"$286\/piece","Brand Name":"+GF+","Model Number":"369 Plate check valve PVC-U\/EPDM PN6 No spring","Minimum Order Quantity":"1","Delivery Time":"3-7","Certification":"3C","Place of Origin":"Switzerland","Payment Terms":"T\/T","Supply Ability":"1\/piece in stock","Packaging Details":"100*100*100mm","Color":"Gray","Applications":"Water Distribution, Chemical Processing, Irrigation","Sanitary Connection":"6.9 bar @ 120 \u00b0C","Standards":"ASTM D1784, D1785, D2466, D2467, D2468, D2464, F1498","Material":"Polyvinyl Chloride (PVC)","Manufacturer":"GF Signet"}}