QUALITY MATERIAL AND DURABILITY: Made of high-quality copper with a plated surface that is rust-proof and corrosion-proof, ensuring durability and a long service life. EFFECTIVE LIQUID STORAGE: G1/4 inch plug fitting with an 18mm diameter, designed to securely seal and store liquid in the water cooling system for an extended period. CONVENIENT INSTALLATION: Thoughtfully designed with a non-slip texture and minus groove, allowing easy hand-tightened installation without the need for additional tools. EXCELLENT SEAL AND PROTECTION: Equipped with o-ring rubber gaskets for a tight, airtight seal, effectively preventing internal liquid leakage, oxidation, and the entry of dust into the liquid cooling device. APPLICATION: Each plug comes with a rubber sealing ring. Suitable for G1/4 inch dental regulations, making it ideal for use in computer water cooling system applications.