Singularity Computers Protium 3.0 Reservoir Tube – 250mm

The Protium 3.0 Reservoir Tube is compatible with all Protium D5-Reservoir Combos and Reservoirs. It comes in 4 different sizes so that you can change your Combo or Reservoir to 100mm, 150mm, 200mm or 250mm sizes. For protium D5-Reservoir Combos this Reservoir Tube threads right into the top of the pump top directly.