Description: These caps will screw directly on to your 1LB propane bottles/cylinders. They will keep them sealed completely in case of any leaks. Perfect for camping, RV use or home applications. Universal Design,fitting for most types Reduces waste, conserves propane. Protect your threads from damage and dirt. and heavy-duty brass. Convenient and Easy to refill in seconds with NO TOOLS required. Built in safety feature that will ensure you NEVER over-fill your smaller tank. This adapter will allow you to use a small 1 LB propane cylinder with your standard BBQ Grill. Great for Tailgaters, Caterers, Campers, and anyone that cooks on the grill or has cookouts. Specification: Propane Tank Cap Material: Brass Inner Diameter: approx. 2.4cm/ 0.9 inch Thickness: approx. 1.5cm/ 0.6 inch Propane Tank Refill Adapter Height: Approx. 6.5cm/ 2.6inch Black Round Hole Inner Diameter: Approx. 3.6cm/ 1.4inch Brass Inner Diameter: Approx. 2.3cm/ 0.9inch Package Includes: 1 Piece Propane Tank Cap 1 Piece Propane Tank Refill Adapter Note: Always Connect the 1 LB tank LAST, Disconnect the 1 LB tank FIRST, start with an EMPTY cylinder. Before refilling, chill the smaller empty 1 LB tank. Larger tank at room temperature (never exceed 85°F)