If you are looking for a more shallow insert that is flexible and comfortable, this insert may be what you are looking for.  We carry a limited quantity of these in 5mm, 6mm and 8mm diameters.  The insertable depth is four inches and the cock cap is 1-1/4″ in diameter.  Connection to your power box is simple, as it has a male snap on top.  If you need a TENS to Snap adapter or a Banana socket to  a female snap adapter cable, you will find these in our Wiring and Adapters section.