ARTICLES NO LONGER AVAILABLE! The DSP501N is equipped with a larger internal solenoid valve recommended for applications requiring rapid venting. This includes operation with squeeze tubes, large cartridges and rotary tables. The more efficient deaeration avoids dripping on tougher materials and is suitable for all types of media. Equipped with a vacuum retention system to prevent dripping of low-viscosity media. Time range adjustable between 0.01 and 31 seconds.