(NON-RETAIL, BULK PACKAGING) Vac-U-Lock Plug with Snaps Bulk. One sided plug for harness attachments. Secures to harness with snaps. Made using phthalate free, non-toxic materials ABS plastic. Vac-U-Lock is a US patented harness attachment system. It was the first of its kind 20 years ago when it was developed and still continues to be the strongest brand name in harness systems today. With countless attachments, plugs and full harness systems, Vac-U-Lock is an all-encompassing modular sex system that gives the user the ability to pair different attachments with different harnesses and Vac-U-Lock plugs to create infinite possibilities. Vac-U-Lock Modular Sex System Accessory from Doc Johnson Novelties the Great American Toy Company. New image added May 20, 2013.