The Adrenaline Fill Nipple Cover is Made in the USA with a ball bearing locking system. Protect your tank regulator, low pressure regulator and the gun itself by keeping out dirt and debris. Anodized black aluminum with Adrenaline Skully logo on the top. It's been designed to match the Adrenaline Reg Thread Saver and Protector. Machined and anodized in the USA and hand assembled by Adrenaline.