Yea I cut plenty a 14612 and 14610 open. Its been a long while.Have you ever even had one of these Purolator bypass valves in your hands? I have played around with them many times when I was using PureOnes. The are built stout, and you will not damage them - maybe with a hammer, lol. Whip City's test showed no light, but again all I'm saying is if the test was done like I described then it would be better validation of the "light leak test" for this particular bypass valve setup. Unknown how well that little flashlight put good light directly on the metal-to-metal seal. With the end cap off, the tester could put known good light on the seal and do a more thorough test. Testing is only as good as the procedure used. Goes with everything tested in the world.
As far as PureOnes ... I used them alot before the tearing heydays. And from what I see today in the M+H/Purolator Spec Sheets, the ones today don't seem as filtering efficient as that older ones made before M+H came along. Today, they would not be near the top of my list to buy and use.
I was being sarcastic when I said it could be delicate.
I don’t see the need to test it any further than he did