BernzOmatic Propane Gas Cylinder, 20 lb Tank (Empty)Model No: 334669. The Bernzomatic 20 lb Empty Propane Tank goes with your gas barbecue grill (sold separately) and accommodates 4.7 Gal of gas. The tank is refillable so you can use it for years. You can also easily carry it around with you to get refilled and take it wherever you need it; your home, RV, vacation home, and more. Low-pressure cylinder for storing liquid propane. Ideal size for gas grills. Steel construction. OPD on the valve for safety when filling. Specifications: Size 12-3/8" x 18-1/16". LP-Gas Capacity: 4/7 gal, Cylinder Volume: 1,323 cubic inches, Collar Height: 4". Manufactured in accordance with DOT-4BA-240.