Black screw polypropylene cap, 8.5mm centre hole Φ 13mm: 100: CCI-C132: Black screw polypropylene cap, closed-top Φ13mm: 100: CCI-SC131131: White PTFE / red Silicone septa, 13mm black screw polypropylene cap, 8.5mm centre hole: 100: CCI-SC132131: Red PTFE / white Silicone septa, 13mm black screw polypropylene cap, 8.5mm centre hole: 100: CCI