Replaced the dump-station plumbing...

I agree that the new parts may not be as robust as the old. I bought new valves that were cracked at the bolt holes from manufacturing. The OPs handles pointing straight up is what allowed the old valves to work so long since there is an opening to allow stuff to get into the valve body when draining. I have cable operated valves inside the belly covering, so I added small vinyl tubing to provide a means of lubricating. Before installing, I tested silicone spray and it swelled the shaft seal causing way too much drag. Motor oil worked just fine.