Resume: The PA pumps series comply fully to the European standard DIN24255/BS EN733, the standard cover both performance and dimension, the PA pumps series are use for pumping clean water or liquids with characteristcs similar to water,For a pump or same model, the performance can be changed by trimming the outer diameter of the impeller, The pump has a back pull-out design, and when a suitable spacer coupling is fitted to a direct coupled unit,the casing and motor can remain in position while, All other pump parts can be removed for simple and quick maintenance