The Evac 910 squatting toilet is made of high quality stainless steel. It is a very light, complete package and comes equipped with the same basic mechanism and discharge valve as Evac 910 toilet.
The toilet is flushed by pressing the push button, which sends an air pulse to the control mechanism. The control mechanism connects vacuum to the water valve and the discharge valve. The water valve opens, letting rinsing water flow into the squatting bowl. After a short delay the discharge valve opens and the contents of the bowl is discharged to the vacuum sewer. The control mechanism closes the discharge valve and, after a short delay, the water valve also closes. The delayed closing of the water valve ensures that a small amount of water is left at the bottom of the bowl. The toilet is then immediately ready for the next flush.
See the technical information in the pdf file attachment below: