Here's the bypass valve I currently have installed:
https://www.summitracing.com/parts/fss-74809
I actually got mine from Advance Auto Parts, but it's the same part irrespective of source. Summit has it; Advance has it; Autozone has it; Pep Boys has it. Whatever.
Looks like it cracked. There are bubbles coming out of the area right around where the valve “axle” is. Reading the online reviews, cracking seems to be a relatively common problem with this particular part. Ducky2009 has the same valve, and his has been trouble-free. I'm curious what others (you?) have used, as I may want to replace mine with something different. Or not. We'll see what you guys come up with! Thanks in advance!