Package includes: you will receive 10 pieces of plugs, each plug contains a rubber sealing ring, you can use it in your computer's water cooling system; Sufficient quantity can meet your needs and replacement. Good sealing: the water stop plug is equipped with o-ring rubber seals, which provide good sealing, which can prevent internal fluid leakage and oxidation and prevent dust from entering the liquid cooling device. Material: the plug is made of quality copper, and the surface is nickel-plated, which is rust-proof or corrosion-resistant, can serve you for a long time. Thoughtful design: the water stop plug is designed with a minus groove and non-slip texture on the surface, no tools are needed, and the installation can be completed by simple tightening by hand, which brings you convenience. Used for: this plug with a size of 1/4 inch, the diameter is 18 mm, suitable for computer water cooling systems; After being covered, it can store the liquid in the water cooling system for a long time. Material: copper. Color: black. Package contents: 10 x Plug with o-ring. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.