These tanks are created to whip cream using a whipped cream dispenser and regulator attachment. Each individual tank comes along with a plastic valve to regulate release of gasoline with out a regulator attachment. Tanks needs to be entirely empty prior to disposal. Product Features: With our 3.3L Nang tanks, https://nangsdelivery22109.blogitright.com/34321189/what-does-nang-delivery-melbourne-mean