The DSP501A-4 is for dispensing applications requiring simultaneous control of between one and four barrels. A common internal manifold distributes the air pressure to four outputs on the side of the unit. A larger internal air solenoid assists in exhausting the greater volume of air found in a multiple barrel configuration.

Suitable for all types of fluids, includes a suck-back feature to ensure low viscosity liquids do not drip. Timing interval from 0.01 to 31 seconds.