The Super System 4 is simpler to load, faster to fill & easier to clean than any other tank. It has a large diameter one piece lid & funnel which clips into place positively & securely, enabling the tank to be filled & emptied quickly. The Paterson 35mm tank takes a single 35mm film, the Paterson Universal Tank takes two 35mm film, or a single 120/220 film. Supplied complete withtwo 35mm/120/220 Auto Load Reel; Water-tight EVA cap prevents leakage during inversion agitation; Uses less than 300ml for a single 35mm film; Well over 2 million sold to date!