Parker Aquasonic Clear Ultrasound Gel-Four 5 liter containers with 2 dispenser per case. Aquasonic Clear Ultrasound Gel has no perfumes, no color, is hypoallergenic and water-soluble. It performs best when used for diagnostic and therapeutic medical ultrasound procedures. It contain no formaldehyde and is not a spermicide. The product referenced on this detail page is sold be 4/cs.