It is just plumbing but needs to handle over 16# pressure. Also see that you have the re-designed cap as opposed to OE caps that fail. See pic of leaking one. Tests good but it leaks. New cap and still going fine. Also had Lincoln fail total dump of coolant. Same bad OE cap design.So I'm curious...even though I'm using the wrong reservoir, does it really make a difference in the flow/performance?
The good and the bad can be id's by the working end as per the pic.