Leonard wrote:
Can anyone tell me if you can manually flush an electric head when the
power is out?

I have an electric Lavac head, where the electric pump is actually 4
feet "downstream" of the head. It can be setup with a manual pump in
series, which would be handy since the electric tends to suffer from
minor clogs. I don't have room to do it, but I can swap out the pump
in about 10 minutes, or even do strip down and clean in about 20
minutes total, so its not a big deal.

Although I'm generally pleased with the Lavac, I hesitate to recommend
it to people that are really looking for something as close as
possible to a home toilet. Most guests are baffled by its operation,
and prefer to hold it until they get ashore!