Dunno... I think some people glue their PCV manifolds together, but others just fit it all together, so that it can be taken apart and cleaned easily... I like the way I did it... Used one of the bazooka screens and connected it to the ball valve nipple (inside the cooler) with a few inches of silicon tubing. works great and I don't need to worry about anything.
Again, personal choice... If you're handy, and want to, build your own. Just know that it's not your only option.