I defected. Possibly after I read the 3rd or 4th thread on this subject, when at my most paranoid phase of ownership
. But, mine came fitted with one of the automatic ball valves and I didn't like the idea of the valve causing a restricted flow, even when open. I tried it with no valve and AN's sump filter with the drain screw, which makes it easy to check for sumping. No problem with sumping so far, standing up to 3 weeks.
I have an unused electric switch valve on the shelf. I don't plan to use it. Happy to send it to someone for postage cost.