VPS Impression Dispensing Gun 1:1 & 2:1 Ratio Type 50. Fits most 50ml VPS cartridges. The VPS Dispensing Gun 1:1 by 32Cart is used to extrude impression materials and bite registration materials from cartridges. It consists of a release lever and a plunger, which are coordinated simultaneously to load and remove the cartridge. The gun also consists of a trigger to dispense the material. Works with 1:1 and 2:1 cartridges. Available in two styles for HP cartridges and old style cartridges. COMPARES TO: Clinicians Choice, Pentron, Vivadent VPS 1:1 Dispensing Gun.