This is a 56 frame wet end with a 2.5" Suction inlet and a 2" discharge outlet.
To ensure correct specification of the suction and discharge
outlets, measure over the threads.
To ensure correct frame size,
measure the following for a 56 frame wet end
On the rear of the wet end, if you look closely you will see P/N 315-1220 as shown in the above picture, this designates the front and rear volute (the plastic casing), internally factory fitted are the seal kit and as standard a 4hp European impellor to fit 56 frame motors.
If you look very carefully (difficult to see) through the centre suction hole at your existing impellor centre (near off centre), you may see a 1.5hp or 2hp or 3hp or 4hp or 5hp stamped into the ceramic impellor, these different impellor sizings can be selected through the drop down box above.