[Richard]

Water separator, and definitely not DOT. After replacing three, I simply took it out, and hard piped. I never once found water in it, so I wasn’t sure what it was keeping out of the six pack.

I think the problem is that the polycarbonate used for the clear bowl does not stand up to the heat of the engine compartment. If you wanted to replace the separator with a less likely to fail part, look for an all metal construction.