The turbo drain on the Fiesta RST is a braided hose and only about 8-10mm bore so 13mm should be plenty.
Thats about the size of the internal hole on the Escort RST as well.

Jim


On 11/02/2012 15:15, nigelp wrote:
Decision made, going to use the boss behind the one indicated on Jim's
photo.  Plan is to take the sump off, jig and drill it at work to 19mm
and tap for a 1/2 BSP union, it will be close on wall thickness for
the boss, but is just about achieveable.  On the photo shown; was that
drilled out for a push in connector?  Next question is what internal
diameter does the return bore need to be? I was planning on abouit
13mm, but some sites indicate 15mm, which is hard to achieve unless I
make a hybrid push in connector, what have you guys used?

Nigel


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