Paterson Multi-Unit 1 Tank System 4 Developing Tank

The Paterson Multi-Unit 1 Tank (System 4) is a modern, user-friendly film developing tank designed for 35mm and 120/220 roll film. Part of Paterson’s highly regarded System 4 line, this tank offers fast filling and pouring, tight light seals, and smooth reel operation—ideal for beginners and seasoned darkroom techs alike.

This Multi-Unit 1 model holds up to two 35mm reels or one 120 reel (reels not included), making it perfect for photographers who shoot regularly but don’t need a massive tank. The wide lid and large funnel system make chemical changes quick and clean, while the translucent tank walls help visualize agitation without opening.

Condition: Mint (New in Box)

This Paterson tank is brand new and unused, complete in its original box with no signs of wear. All seals, caps, and components are present and in perfect condition. Ready to load up with reels and start developing straight out of the box.

A fantastic addition to any home darkroom or portable processing setup—fast, efficient, and trusted by labs around the world.

We usually ship within two business days of receiving payment. If you are in a hurry, please contact us about rush shipping options.

We pack everything carefully and are pretty meticulous about what we sell. You can expect to receive a fully functional, conservatively rated item.

Shipping is available to most countries worldwide. Please ask if purchasing from a country you think we might not ship to.