Enhance your CO2 system setup with this high-quality Aluminum Cylinder Adapter, designed to convert a female thread TR21-4 connection to a male thread W21.8-14. Perfectly engineered for seamless compatibility, this adapter allows you to connect your SodaStream cylinder to a W21.8-14 aquarium CO2 regulator or homebrew beer barrel regulator with ease and reliability. Key Features: · Premium Aluminum Construction: Crafted from durable aluminum, this adapter offers high hardness and excellent resistance to damage, ensuring long-lasting performance and reliability. · Precise Thread Conversion: Features a female thread TR21-4 to male thread W21.8-14, providing a secure and leak-free connection between SodaStream cylinders and CO2 regulators. · Versatile Application: Ideal for attaching SodaStream cylinders to aquarium CO2 systems or homebrew beer barrel regulators, making it a practical accessory for hobbyists and enthusiasts. · Compact and Lightweight: Measuring approximately 3.6 cm (1.4 in) in length and weighing only 32g (1.1 oz), this adapter is easy to carry and handle, perfect for events or on-the-go use. · Not Suitable for Carbonation: Designed specifically for CO2 aquarium and homebrew applications; this adapter is not recommended for carbonation purposes. Specifications: · Material: Aluminum · Color: Silver · Thread Type: Female Thread TR21-4 to Male Thread W21.8-14 · Length: Approx. 3.6 cm / 1.4 in · Weight: Approx. 32g / 1.1 oz Package Includes: · 1 x Cylinder Adapter (Female TR21-4 to Male W21.8-14) This Aluminum Cylinder Adapter offers a durable and efficient solution for connecting SodaStream cylinders to aquarium or homebrew CO2 regulators. Its sturdy build and precise threading ensure safe and stable connections, making it an essential accessory for CO2 system enthusiasts.