I had the primary/water sep. changed to the CAT filter as suggested by Dave A. I'm starting to think about doing some of my own maintenance and was wondering if the CAT filter 133-5673 is replaced as two parts or only one part retaining the plastic water bowl. And, if separately, how does the plastic bowl come off? I'm assuming that you just unscrew it but I hate to assume anything when I am so far out of my experience level. Thanks in advance.
Jerry