Size and Compatibility: This large-sized bottle cap is designed to fit GL45 neck size bottles, making it ideal for laboratory applications. It accommodates silicone tubing with an inner diameter of 7mm/1.78inch, ensuring a secure and efficient connection for liquid handling. High-Quality Material and Durability: Crafted from 304 stainless steel, the cap is autoclavable at temperatures up to 140°C. Its sturdy construction ensures durability, resistance to rust, and the ability to withstand high temperatures, making it a reliable choice for rigorous lab environments. Precision Engineering: The cap features an inner diameter of 8.5mm and an outer diameter of 9.8mm, with an inner aperture of 7mm. The cap's dimensions, including a cap inner diameter of 45mm and a total height of 60mm, are meticulously designed to ensure a perfect fit and optimal performance. Versatile Use: Specifically designed for sampling and transferring liquids in a mobile phase, this bottle cap is an essential tool for any laboratory dealing with chemical and biological samples. Its precise design helps in maintaining the integrity and purity of the substances. Color: As Shown Material: Metal+Plastic Specification: 2 holes Package Contents: 1*Stainless Steel Bottle Cap