Looking fro a fuel vent check valve

Hey guys-

A while back I saw a thread where somebody had Tee'd a spring loaded check valve in one of the fuel vent lines to function as a vacuum relief in the event of iced over fuel vents.

I've been looking for that thread so that I can pay tribute to (shamelessly rip off) that idea, but can't seem to find it.

Can anybody point me in the right direction? I believe it was a valve from McMaster Carr installed in the vertical run of the vent line in the cabin somewhere.

New owner - not builder, here. I'd like to know more about this concept. What valve is used for the check valve? I'd imagine that it would have to open at a fairly low vacuum pressure? Also what happens in rain? Is water intrusion through the vents an issue when flying?

Post #9 and #12
https://vansairforce.net/community/showthread.php?t=198280

Carl

I recall the thread, but can’t seem to find it either.. I found this though.. https://www.myrv10.com/N104CD/upgrades/20090525/index.html

I found it! Does this link work?
https://vansairforce.net/community/showthread.php?t=165701

Thanks guys!