x.o,here a pic for u to understand it better.
View attachment 324408
this is call 4-1 extractor.u can see clearly that all the primary pipe r merge into 1 at the end
of the extractor.
View attachment 324409
this is call 4-2-1.the primary runner 1-4 and 2-3 r merge separately to make secondary
runner.the secondary runner is the second piece of the extractor in the pic.hope this help.
View attachment 324408
this is call 4-1 extractor.u can see clearly that all the primary pipe r merge into 1 at the end
of the extractor.
View attachment 324409
this is call 4-2-1.the primary runner 1-4 and 2-3 r merge separately to make secondary
runner.the secondary runner is the second piece of the extractor in the pic.hope this help.