These open top caps have a hole in center and are available with various thread sizes and apertures. GL 14 and 18 fit hose connectors LG-10818. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Wilmad-LabGlass brand laboratory glassware features over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. Bel-Art and H-B Instrument brand laboratory supplies complements Wilmad-LabGlass with over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons.