Electric termination valves

Ron the actual valve has the T handle just like your picture.  It is a standard manual valve that they add an after market electric actuator to.  If you remove the actuator it looks and functions just like a manual valve.  Because it is.

In my attempt to clear my jam I removed the actuator and opened / closed the valve manually a dozen times hoping I could clear things that way.  But no joy.  I had to disassemble the valve and clear the jam.  Which turned out to be much easier than I expected.  Except there was some strain on the pipe, they were glued up at a slight angle. So I had to really work to get it all back together with the gaskets in the right place.  If there had been no strain on it the job would have been simple and easy. 

I too have a gravity pipe outlet with no valve (2009/2551), just an end cap. So I purchased Valterra-T58-Twist-On-Waste-Valve.  https://www.etrailer.com/RV-Sewer/Valterra/T58.html This item simply attaches to the end of the pipe with a bayonet fitting that allows me to attach a 3 inch flexible sewer hose equipped with a bayonet fitting when dumping. Now I have a manual valve at the end of this sewer pipe with a handle within easy reach when and if I need to bypass the Sani-Con system.
This to me was a simple and inexpensive fix for this problem. I cannot understand the logic having no valve at the end of this sewer pipe. If for any reason there was grey or black water in this pipe, removing the end cap would make for a memorable experience. I believe the newer coaches are equipped with a manual valve as seen in a PC video.