This high-quality brass adapter allows you to connect a standard TR21-4 threaded CO2 cylinder to your Quooker Cube system, which requires a TR21-3 male connection. Crafted from durable brass for excellent wear resistance and a reliable, airtight seal, it ensures long-term performance and safety. Features: * **Secure Conversion:** Precisely converts TR21-4 female thread to TR21-3 male thread for compatibility with the Quooker Cube. * **Durable Brass Construction:** Made from robust brass material, offering good corrosion resistance and ensuring a durable, leak-proof connection. * **High-Pressure Rated:** Designed to withstand working pressures up to 3000 PSI (207 bar), far exceeding the typical 100-120 PSI required by home soda makers, for safe and controlled gas inflation. * **Easy Installation:** Simply align and hand-tighten the threaded connection, then finish with a moderate turn using a wrench. Avoid over-tightening to protect the sealing ring. Always check for leaks after installation by slowly opening the gas source. * **Compact & Versatile:** Its small size makes it a practical accessory not only for your Quooker Cube but also potentially for other compatible applications or outdoor activities. Specifications: * Color: Yellow & Red * Material: Metal (Brass) * Thread Conversion: TR21-4 Female to TR21-3 Male * Package Includes: 1 x Connector with Protective Cap Important Notes: * Please verify your CO2 cylinder and appliance thread types (TR21-4 and TR21-3) before purchase to ensure compatibility. * Slight color variations may occur due to photography lighting and monitor settings. * Package includes only the adapter with cap as listed; other products are not included.