Features FOR SODA MACHINE: Excellent quality CO2 bottle adapter is suitable for various soda machines, bring great convenience for your life GOOD SEALING WITHOUT LEAKS: possess good sealing performance, no air leakage when connected to the cylinder, more convenient to use TR21‑4 FEMALE THREAD: Can be installed on the TR21‑4 threaded soda cylinder body to play the role of conversion interface WEAR RESISTANT STAINLESS STEEL: Made of high hardness stainless steel material, durable and wear-resistant, possesses a long service life BRIGHT SURFACE: adopts surface plating, shining as a mirror, corrosion resistant, not easy to oxidize and rust Specification: Item Type: Soda Bottle Adapter Material: stainless steel. Female Thread Size: TR21-4 Male Thread Size: CGA320 Package List: 1 x Soda Bottle Adapter 1 x Gasket Package List 1 x Soda Cylinder Adapter 1 x Gasket