PrimoChill 120mm CTR Phase II - Blood Red NEWCompression Ring End Caps, NEW Colored Compression Rings Pre-Installed Ready To Use, Delrin compression end caps (optional Acrylic) Simple Reservoir Mounting System, Rigid Mount Hardware and template Included Made in the USA, Patent Pending Design Laser Cut Acrylic Tubes, Inner Diameter: 2.25 in (57mm), Outer Diameter: 2.50 in (63mm), Overall Length: 5.12 in (130mm)