Can someone please help me plumb the return line on my DCP 4000? The only fitting I could find at my local Handyman store that would fit the output of the pump was the female portion of a 1/2" union. However the ID of the output of the pump seems to be over 3/4 and closer to 1". So my questions are as follows:
Is there another fitting that would SCREW on to the output of the pump that would match or closely match the ID of the pumps output?
If I'm stuck with the 1/2" union, would it be better for me to continue the rest of the return at 1/2" or would it be better to bump up in size? Also could you please explain why?