High quality carbon dioxide cylinder adapter, compatible for a wide range of soda machines. Good sealing performance, no air leakage when connected with the cylinder, more convenient to use. Made of excessive hardness materials, sturdy and wear-resistant, prolonged provider life. The surface is electroplated, shiny as a mirror, resistant, not easy to oxidize and rust. Type:5/8-18UNF Colour:Silver Material:Metal Package Contents: 1 x Aquarium CO2 Regulator Only the above package content, different products usually are not included. Note: Light mirrored image and assorted exhibits can cause the colour of the object in the photograph somewhat varied from the genuine thing. The size allowed error is +/- 1-3cm.