Protect and care for your Scuba cylinder assembly with our XS Scuba Universal Valve Caps. Designed specifically for Deluxe K or PRO valves (not DIN valves), these vinyl protective caps shield your valves from damage and keep out dust, dirt, and water. They also serve as a practical means of identifying your cylinders and signaling their fill status to boat and dive operators. Available in various colors, each valve cap comes with an unattached black nylon string for easy handling.