Vac-U-Lock Crystal Jelly Dong Pink 8" Box. 8 inches long by 1.5 inches wide translucent pink jelly penis attachment for vac-u-loc plug. If you're looking for something special, try this pink Crystal Jellies Dong by Doc Johnson. Its exquisite shape and design is great for diversifying your strap-on excitement. Compatible with the most widespread harness system, Vac-U-Lock. You are sure to enjoy this for hours and hours of role-play action. Thick-veined texture. Made using phthalate free, non-toxic materials PVC. Vac-U-Lock Modular Sex System Attachment from Doc Johnson Novelties the Great American Toy Company. New image added May 20, 2013. Please note the packaging has changed on the Vac-U-Lock Sex System. -old yellow, gold box.