Features For Soda Machine: Excellent quality CO2 cylinder adapter is suitable for various soda machines, provide great convenience for your life Good Sealing Without Leakage: Possess good sealing performance, no air leakage when connected to the cylinder, more convenient to use Tr21‑4 Female Thread: The soda cylinder adapter can be installed on the TR21‑4 threaded soda cylinder body to play the role of a conversion interface Wear Resistant Stainless Steel: The soda cylinder adapter is made of high hardness stainless steel material, durable and wear resistant, possess long service life Bright Surface: Adopt surface plating, bright as a mirror, corrosion resistant, not easy to oxidize and rust Specification: Item Type: Soda Cylinder Adapter Material: Stainless steel Female Thread Size: TR21-4 Male Thread Size: CGA320 Package List: 1 x Soda Cylinder Adapter 1 x Gasket Package List 1 x Soda Cylinder Adapter 1 x Gasket