High quality carbon dioxide cylinder adapter, suitable for a of machines. Good sealing performance, no air leakage when connected with the cylinder, more convenient to use. It can be mounted on the cylinder of TR21-4 threaded cylinde to play the role of conversion interface. Made of high hardness materials, and wear-resistant, long service life. The is electroplated, bright as a mirror, -resistant, not easy to oxidize and rust. Type:3/8-24UNF Colour:Black Material:Metal Size:About 47.9mm Package Contents: 1 x CO2 Cylinder Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.