Vac-U-Lock Accessories Ultra Harness 2 Only with Snaps Bulk. Harness with Velcro and snaps no plug included. Introducing Doc Johnson's Ultra Harness II. This harness has an adjustable waist up to 53 inches, an open crotch for maximum comfort, easy access, and non-slip action; all designed to give you command and control for your erotic pleasures. This Harness can be used by women or men. The opening under the plug is high enough to allow the man's penis to hang below. Just add your favorite Doc Johnson Vac-U-Lock attachment and you're ready to go! You can purchase a separate Vac-U-Lock plug or dong that attaches with Velcro or snaps. This Harness can be used by women or men. The opening under the plug is high enough to allow the man's penis to hang below. Made using phthalate free, non-toxic materials: Vinyl and Nylon. Waist sizes 26 to 53 inches. Vac-U-Lock is a US patented harness attachment system. Vac-U-Lock Modular Sex System Accessory from Doc Johnson Novelties the Great American Toy Company. Please note the packaging has changed on the Vac-U-Lock Sex System.