The Swatscope 2-Plus DuoLoc Optical Adapter facilitates attaching one optical device to another. With this device, you can attach a night vision monocular to your day-time optic, riflescope, or Swatscope periscope.
The 2-Plus DuoLoc Adapter features two set screws, with a thumb screw on each end of the adapter. The smaller end of the adapter fits over the objective lens of your nighttime optic, and the larger end fits over the eye piece of your daytime optic. The front portion of the 2-Plus Duoloc has a larger inside diameter than the standard DuoLoc; this facilitates using a daytime optic with a larger eyepiece.