Trigger systems bulkhead

Bulkheads came with mine & 1 inch PVC pipe fits into them
 
Bulkheads came with mine & 1 inch PVC pipe fits into them

Ok i have 2 pics below showing a durso drain pipe which is 1 inch going into the bulkhead and a return pipe which is 3/4 inch going into the bulkhead. Now the thread side is wider on both sides but fits the holes on the bottom of my tank perfect. (The thread side that is.) So what size bulkheads are they? Is the one with the return pipe being 3/4 going into a 1 inch bulkhead or is it a 3/4 inch bulkhead? Also same question with the drain pipe bulkhead. what size is it.

Reason why i ask is because everyone is saying the trigger systems sump has 1 inch bulkheads yet the bulkhead that my 1 inch durso goes into does not fit. but the bulkhead that my 3/4 inch return pipe goes into does. Confused......










see the 1 inch pipe fits in bulkhead but bulkhead does not fit in trigger systems hole. But the one inch pipe not in bulkhead fits through hole
 
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3/4" hole surrounded by plastic will be bigger than 3/4"

Ok i have 2 pics below showing a durso drain pipe which is 1 inch going into the bulkhead and a return pipe which is 3/4 inch going into the bulkhead. Now the thread side is wider on both sides but fits the holes on the bottom of my tank perfect. (The thread side that is.) So what size bulkheads are they? Is the one with the return pipe being 3/4 going into a 1 inch bulkhead or is it a 3/4 inch bulkhead? Also same question with the drain pipe bulkhead. what size is it.

Reason why i ask is because everyone is saying the trigger systems sump has 1 inch bulkheads yet the bulkhead that my 1 inch durso goes into does not fit. but the bulkhead that my 3/4 inch return pipe goes into does. Confused......



 
3/4" hole surrounded by plastic will be bigger than 3/4"


look at my above pics in post above yours. So your saying the one my 3/4 inch pipe is going into is a 1 inch bulkhead? Because the one my 3/4 inch pipe is going into fits perfectly in the Trigger systems hole. so i will have a 1 inch drain and then will have to reduce it to 3/4 inch pipe to fit in the trigger systems holes to the sump?
 
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