SwiftFF5

I guess this means that you're going to have to stop rubbing bacon grease all over your tanks, eh?  <grin>

I do like this version better, nice job.

OK, thanks.  That helps.

OK, I'm still a little confused by this whole concept.  I understand that there are commercial versions that draw a vacuum as well, but wouldn't it make more sense to slightly pressurize the housing?  That way, if there were a slight leak, you would be visually alerted by a stream of bubbles, rather than having the vacuum suck water INTO the housing.  What am I missing?  There must be an obvious reason why the commercial versions, as well as yours, draw a vacuum instead of pressurizing the housing.

When I recently booked a flight on Royal Jordanian for a trip to the Red Sea, there were multiple warnings that the credit card used to purchase the ticket must be shown at check-in.  I think that this is becoming very common now.