Microsolv Screw Cap with Tan Silicone Rubber / PTFE Pre-Slit Septa, bonded in knurled, PP blue Caps, for use with 9-425mm thread, 12x32mm autosampler

Pre-slit for easy penetration by autosampler needles and to prevent "Septa Plunge". Recommended for Waters® Alliance & Acquity instruments. Ultra-pure Silicone Rubber is a natural Tan color and will not extract pigments. Use this Cap for excellent results in LCMS/MS. Compare to “HPLC Certified” brands.