Features: 1Adopt 1/4in trumpet& 8209shaped thread, with a gasket, can be easily connected and installed. 2Can be used with oxygen tanks or aeration pumps, or with CO2 to make beer carbonated faster. 3Adopts food?grade 316 stainless steel, environmentally friendly, non?toxic, and durable in use. 4This diffusion oxygen stone is easy to clean, can be disinfected or simply cooked in water for 1?3 minutes. 5To avoid clogging the oxygen stone hole, do not touch the oxygen stone with your hands. Condition: 100% New Item Type: Diffusion Oxygen Stone Material: 316 Stainless Steel Color: Silver Thread: 1/4in Trumpet-Shaped Thread Weight: Approx. 26g / 0.9oz Product Size: Length: Approx. 47mm / 1.9in Diameter: Approx. 13mm / 0.5in Package Included: 1 x Diffusion Oxygen Stone