Function: This item can help you to refill your cylinder from carbon dioxide tank,then you can and go out whenever you want and no need to go to the local inflation point to refill your cylinder expensively. This fill adapter hose kit is used to your ( W21.8-14) external commercial CO2 tanks like 5lb,20lb and 50lb,so that you can refill your Tr21-4 thread cylinder yourself . Joint type: W21.8-14(DIN477) W21.8-14(DIN 477) connector Compatible With M22-14, Common in , JP, UK, Germany, France, , , Switzerland, Russia, Ukraine, South Africa, Sweden, Chile, Republic, Singapore etc. The length of stainless steel hose:24inch Note: 1.This item can not work on New Zealand and Australia cylinder.If you have that NZ / AU cylinder (CGA320 thread). 2.Our Adapter does not work on residual pressure valve (RPV valve),please check before ordering.If your tank has RPVvalve, you need to order an extra"RPV valve pushing adapter",so that you can use our hose kit to refill your cylinder youself as well. Material: Copper+aluminum +pu colour: As shown Package Contents: 1 x Co2 Refill 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.