The Paterson Super System 4 Universal Tank is constructed from high-impact polystyrene that stands up to high volume use. This tank has no hidden parts, and is always easy to keep clean. The Super System 4 Tanks are durable, easy to use, and provide consistent, even film development. It features a unique snap-in light trapping funnel for quick filling and emptying, to ensure even development and precise processing times. The Super System 4 Tank offers a choice of agitation methods; use inversion agitation, rotary agitation with the removable agitator rod supplied, or a combination of both.