The D5 Photon Reservoir/Pump Combo combines the ultimate tube reservoir with the best pump available for PC water cooling. The D5 PWM pump features exceptional performance and unrivalled reliability. This version of the D5 pump is PWM compatible and can be connected to the motherboard for speed control. The tube is made from a quality toughened glass, which is both crystal clear and highly resistant to staining. In the center of the tube is an acrylic lighting pole that connects to a 5mm LED on the base of the reservoir. The LED is easily replaceable so you can match the lighting colour to your build. Unlike other tube reservoirs, which use cheap plastic brackets, the XSPC Photon has high quality CNC cut aluminium bracket. The bracket connects to both ends of the reservoir which give a solid hold without blocking the view of the tube. Photon reservoirs can be used either horizontally or vertically. If using the Photon horizontally, make sure to keep the reservoir topped up to the top, or air can get sucked into the loop. Each reservoir/pump combo is hand assembled and pressure tested before sale to ensure reliability. V2 Photon reservoirs include a new bracket which attaches directly to 120mm and 140mm radiators. It also has an improved fillport with lower restriction, to make filling the reservoir easier.