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.