Brass material: The adapter is made of high-quality brass with good wear resistance, ensuring durability and airtightness for long-term use. Easy installation: This cylinder conversion adapter requires aligning the threaded connection when attaching to the gas bottle. Tighten by hand first, then moderately with a wrench. Avoid over-tightening to prevent damage to the sealing ring. After installation, slowly open the gas source and check for leaks to ensure proper function. Working pressure range: Designed for cylinder thread conversion, this adapter supports a working pressure up to 3000 psi (207 bar), significantly higher than the typical 100–120 psi required by home soda machines. It allows safe and stable control within high-pressure applications. Thread size: 1 x thread conversion adapter (TR21-4 female to TR21-3 male). Offers compatibility when using TR21-4 threaded bottles with compatible systems. Please verify thread specifications before purchase. Wide application: This CO2 brass cylinder adapter fits most TR2 standard CO2 bottles available on the market (confirm bottle thread type prior to use). It is a suitable accessory for compatible Cube system users. Its compact design also makes it convenient for outdoor use. Color: Yellow & Red Material: Metal Package Contents: 1 x connector with cap Note: Light reflection and display differences may cause slight variations between the product color in images and actual color. Measurement may vary by +/- 1–3 cm.