The DDR – DŌS Dual Reservoir is an aesthetically-pleasing fluid containment system that stores up to two liters (2L) of fluid in each side. It connects directly to an Apex, Apex Lite, or Apex Jr. in order to make use of optical sensors that notify you when levels are low. This strong, cast-acrylic product has a low-profile that prevents it from tipping over and is simple to refill. Push-fit tubing connections facilitate the process. The DDR can be used for 2-part (Alk/Cal), additives, and other applications. It measures 10.5" x 8.5" x 5.5" and has a two-pound weight. Please note: only fluids compatible with acrylic should be used and solvents or other fluids that may be reactive with acrylic such as methanol should be avoided.