Tunnel Plug Double Large - Clear. The Double Tunnel Plug features two plugs that slightly taper to the tip which makes it one of the most innovative butt plugs available on the market. In addition to being a standard butt plug, you can use the tunnel hole that goes all the way through the plug for various play including lube insertion, fingers and watersports. The clear version also makes it possible to see right into the other person. It is made of special blend of silicone and TPR called PF Blend. It is available in clear, black, or red. It is safe with water based lubes. Wash thoroughly with mild soap and water. This product is not compatible with latex.