silicone seal ring 1)FDA silicone 2)various colors 3)custom sealing ring 4)good quality, reasonable price Silicone O Rings Manufactory -High-Quality Rubber ... , U-Ring, E-Ring,SizeCustomized/standard and nonstandardMaterialNBR, HNBR, EPDM, SILICONE, VITON, FFPM, PTFE, etc.TemperatureCommon: 20~50degree centigrade;NBR(-40 ...