Thanks for the lead - will try to check it out. BTW - the 4-107 does have wet liners (the jacket water touches the outside of the liners) with o-rings to seal them.
I have the 4-108 and I think I read that it has dry liners. The reason I was interested is that apparently it's best to use the heavy duty antifreeze(red) vs the green stuff if you have wet liners. At the time I did not know what liners I had and so I switched from the green to the red. Not really necessary now with dry liners, but since I'm not going to flush the system out again to switch back, I will keep with the red.