Propane Tank Mac Caps 1 lb Cylinder Seal Protect Save Stove Lantern Camping Propane Tank Mac Caps Propane Mac Caps A Better Propane Cap! Keeps 1 lb Cylinders fresh and ready for use! Protect cylinder threads from damage Seals and protects valve from dirt, dust, and debris. Specifications Dimensions: .5" x 1.125" Each Weight: .9 oz Each Cap US STOCK FAST SHIPPING