The compact BAUER Vent Control Valve (VCV) has an overall length of only 4 1/2 inches and can be used with any gas assist control unit (standard with the BAUER NCU™). The VCV acts as a direct flow-through device giving the BAUER NCU™ full control of the profile during injection, but during the venting phase, an internal check valve diverts volatiles and contaminants to the atmosphere, reducing or eliminating the periodic cleaning and maintenance of the high pressure regulators.