OK I'll try,It's just that it would be easier if I could show you.
I hav ethe 1250 also and I also noticed that the sizes werent right.THe barbs for the tubing is the stated size,1/2 in and 3/4 in,but the threaded side of the fitting is the diffence.The 3.4 barb has a 1/2 thread which means that it is 1/2 in,the hole is 1/2 in not the od of the threads .The same with the 1/2 barb which is 1/2 but the threaded side is 3/8,the hole is 3/8.This is a reducer,3/4 barb by 1/2 thread,1/2 barb by 3/8 thread.
If you have a 1/2 pipe nipple around just thread it into the inlet side of the pump and you will see,its 1/2 in.So even though you may get to use 3/4 tubing on the inlet or 1/2 tubing on the outlet there is still a reduction at both points.
This is what Ive been noticing with all the wc stuff.Just because you can run 1/2 tubing it seems that its all being reduced to 3/8.And the 3/8 tubing is worse as it reduces to 1/4.
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