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It was the brass fitting not copper sorry it has to have the teeth to grab and hold the rubber hose. Run the Aux.line to 1" and your rear plumbing line to 1" and your heater core line from the 3/4" . As the pic. shows it gives you a good angle to work from, it takes a little tweaking but nothing crazy. I used yellow handled tin snips to cut the line,nothing speacial.
If you got the same one I had it's a bit snug but it goes on pretty easy. I took a piece of the hose in with me to check the fit. So if you got the same one you should be in business. Also it's a tight fit in that corner under the hood, so what I did was put a bungee cord on the aux. pump to hold it back out of the way, that made it a little easier to move.
It was the brass fitting not copper sorry it has to have the teeth to grab and hold the rubber hose. Run the Aux.line to 1" and your rear plumbing line to 1" and your heater core line from the 3/4" .
my part, like the link you sent has the 1''s on the ends and the 3/4 at the bottom (reducer fitting). Forgive my nitpicking but would not the aux and core lines goto the 1"s and the rear plumbing use the 3/4 as in your pic?
Finally got this done. It is a tight corner and very sunggly fits on these hoses. I replaced the rear line which was 7/16 OD X 5/8 ID with a 1/2 ID as the 5/8 I got from the shop did not fit well on the metal line in the wheel well. 1/2 hose in the 3/4 fitting was fun as well..had to lube it a tiny bit.
I thought the turnkey clamps would help in tight areas but seems hard to get the tight clamp on larger fittings but I think I'm good.
Real test is in a hour as it seemed to oddly leak only after the car was off and sitting for some reason. Maybe the coolant that was pooled in the lines exposed the leak in the Y fitting.
