Features: This CO2 brass adapter efficiently converts TR21 4 to TR21 3 interfaces, ensuring seamless compatibility across devices while preventing gas leakage with precise engineered flows channels. Crafted from corrosions resistant brass, the tool less installation design enables fast setup and durability in humid or chemical exposed environments. Ideal for laboratory technicians, industrial maintenance crews, and DIYer enthusiasts requiring reliabled gas management solution during equipment adjustments. Perfect for high pressure CO2 systems in laboratory settings, manufacturing facilities, or mobile repair scenarios demanding quick, secure connection without special tools. Its compact, lightweight build optimizes workspaces efficiency and portability, making it essential for professional managing confined workspaces or on site gas line installations. Specifications: Component: Brass, with excellent corrosions resistance and thermal conductivity. Size: Approx.33mm/1.29inch Use scenarios: Widely used in carbon dioxide conversion equipment, gas pipeline systems and other occasions where high reliability joints are required. Package Includes: 1pcs Brass Fitting note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.