A screw pump is a type of positive displacement pump typically using two or more screws that intermesh to pressurize fluids and move them through the system. The movement of the liquid is created with the screws rotating on an axis creating positive displacement suction to help push the fluids from the inlet to the outlet where it can be discharged. The fluid pressure increases as it moves through the system before being ultimately expelled. Screw pumps are capable of handling viscous and cleaner, thinner fluids.