The Monsoon Modular Reservoir System allows you to configure exactly the reservoir you need for your build-no more forcing your build to fit around an off the shelf, one-size-fits-all reservoir. All of the components are offered individually allowing you to mix and match different end caps, couplers, tension rods, tube lengths, mounting options, fill and drain ports, pump options, and lighting. Molded from heavy duty nylon, this COUPLER allows you to connect two or more sections of tube and provides the ability to add two side facing ports anywhere along the length of your reservoir in 50mm (2") increments based on the tube lengths you opt to use for your reservoir configuration. The mounting holes allow you to mount your reservoir perpendicular, 60 degrees left or 60 degrees right. Includes one molded nylon coupler, two O rings, six threaded set screw connectors and box wrenches. Model: MMRS-BH-BK.