The green clip was used on the older Restube versions to make it visible that a new CO2 cartridge had been screwed in. When the Restube was triggered, the clip fell off and into the water, revealing a red spot. The clip only had an indicative character and did not have a technical function. The absence therefore does not affect the function of your Restube. If you have an older Restube model and do not want to do without the clip, we can send you one. For this we need your address. The new Restube models beach, active & extreme (lifeguard from 2022) have a new, modern display system, which works completely without a clip that drops into the water. We are working hard on Restube lifeguard, automatic and pfd by Restube to be able to offer these products without a clip. The perfect function is important to us, the development with all the necessary long-term tests can still take over a year here.