Keep the Dirt Out of Your Umarex Zelos PCP Protect your air tank from dirt, dust, and debris with our new fill port dust cover, designed specifically for the Umarex Zelos PCP. Simple to install and easy to use, the cover features an internal O-ring that keeps it securely in place while helping prevent unwanted debris from entering the fill port. Simple protection. Secure fit. Cleaner fill port. Keep the dirt out and your Zelos ready to perform.