Indy Cylinder Heads Billet Rear Main Seal Holder

Has anyone used this yet? Saw it in MCG and they said it won't leak!

I have the one from Mancini and I believe it's the same one. Installed on my BB and so far no leaks. I don't know if I would go so far to say it wouldn't ever leak but I like the two "O" ring grooves on either side for "O" ring material rather than the original hard gasket.

I use them on all the motors I build. I have a picture in my book of the back of a block that has about 3 years of use and it is dry as a bone.