A “Wet End” is the collection of parts which come into contact with the liquid.
A “Pump Less Motor Kit” is all the parts except the motor. The “Wet End” is a subgroup of the “Pump Less Motor Kit”.
A trim is when the impeller diameter is reduced from its standard full size.
Magnetic Drive Pumps are trimmed for two major reasons.
First, a trim allows a pump to become closer to the targeted duty point of the application. An oversized pump will have to be restricted with a valve to meet the desired duty point, and it will consume excess horsepower, wasting money.
Second, magnetic drive pumps are restricted by the horsepower of the motor and the strength of the magnets. Liquids with higher specific gravities and viscosities require more horsepower and magnetic strength. If the motor is overloaded, it will burn up. If the magnets are overloaded, the magnets will lose temporarily lose their connection to each other, resulting in the impeller ceasing from turning, and as a consequence, liquid will not leave the pump. The magnets will not reconnect until both magnets come to a complete stop. Trimming the impeller reduces the flow, head, horsepower, and NPSHa, so it prevents the motor and magnets from becoming overloaded.