Not JUST a holding tank
The VHT
http://www.sealandtechnology.com/productpages.asp?pid=23 is a combination vacuum tank/holding tank for the VacuFlush toilet.
And it's not new...When they first introduced about 10 years ago, they targeted the "muscle boat" market--those go-fasts that are all engine room and "playpen" bed, with NO standup headroom or any space for a holding tank and plumbing...so the only toilet on most of 'em was a portapotty. The VHT was supposed to be the great alternative. I haven't heard anything about it in 7-8 years...thought it had mercifully died. Somebody at Dometic must have found the file and decided to try aiming it at a slightly different market.
It's a horrible idea...and STINKS! because there's no way to keep a tank that gets NO air aerobic.
