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. Built with premium copper material and a plated, corrosion-resistant surface, this G1/4 plug fitting is designed for durability, reliability, and long-term use in liquid cooling systems. Its 18mm diameter design provides secure liquid storage, effectively sealing your system and maintaining performance over extended periods. Engineered for convenience, the fitting features a non-slip texture and minus groove, allowing for quick, tool-free installation by hand. Each plug comes with an o-ring rubber gasket that ensures an airtight seal, preventing leaks, oxidation, and dust intrusion. Perfectly suited for G1/4 thread applications, this plug is an excellent choice for maintaining and protecting your PC water cooling setup.