There are lectric ones on ebay with 4 way control
here. Not sure about the spiogt diameter required though
Looks interesting for me, but only if it works as an on/off valve.
There are only two pins to the solenoid/motor Peter so looks like it could only be such. The low price seems to confirm
.......I had a really good look at all the pics of the Bypass identified by John, I don't want to stifle any ideas and thanks for bothering to search, but I don't think its a 4 way. To me it looks like the Valve sits at the junction of 3 ports with one going to a T, which makes it very similar to the Taxi one in concept. It's really hard to tell when they don't provide enough detail, not even the ID diameter of the ports.
Given it has four hose unions I don't see how you can conclude it's a three port valve Mark
Standard heater hose is 16mm (⅝") i/d and this is a heater valve so no worries there.
