Reasoning, the lid keeps blowing off and it is old and now the plastic bleeder value is cracked at the lid . Also the multiport leaks, even after I replaced the spider gasket last year. It just doesn't seem to be worth trying to fix anymore.
Thanks for the reply.
I have found two source that list the side mount version at about $200 more expensive than the equivalent top mount. I am not sure why the drastic price difference, as you suggest, they seem to work exactly the same. I am going to have to do some replumbing regardless (probably moreso with the top mount), but for a $200 savings , I do not mind the extra work.