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I read an article about the restricted nipple. I dont remember the source but it said the restriction was there to reduce pressure in the heater core that may cause rupture if not restricted. I really didnt see the sense behind that idea but the article went into detail with pressure gages and how the guy had to replace 3 heater cores. I have used just a plain nipple on many of my Oldsmobiles and never had a problem. If you have the correct nipple though I would use it.
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