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Specifications: Size:43mm*20mm/1.7''*0.8''; Diameter: 9.5-10mm Material: ABS resin ; Diaphragm Material: Silicon Rubber Colour:Black and White Very good cold resistance and can be used in cold environments for long periods of time Silicone rubber: It has characteristics that other similar materials are difficult to replace: adsorption performance, good thermal stability, chemical stability, high mechanical strength, etc. Strong resistance to acid, alkali, salt corrosion ability Medical grade material, safe and nontoxic Widely used in water treatment, air purification, automotive parts, machinery industry, medical equipment, household appliances and other fields Package included: 4 Pcs 10mm 3/8" ABS One Way Water Non Return Check Valve