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    Reservoirs for Custom Water Cooling

    Reservoirs are the backbone of any custom water-cooling loop – managing pressure, simplifying filling, and ensuring stable flow. But they’re more than just practical – they add visual flair to your build. Whether cylindrical, flat-mounted, or RGB-lit, there's a reservoir to match your system. Discover the perfect reservoir for your loop today!

    133 Results
    WAAU-672
    (0)
    Expansion tank with D5-NEXT pump, made of resistant borosilicate glass, 230 ml capacity, LEAKSHIELD protects against leaks, with RGBpx lighting
    329,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-689
    (1)
    Reservoir for water cooling systems, for D5 and VPP pumps, including VPP Apex pump, discreet design, integrated RGB lighting
    124,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-708
    (0)
    65 ml expansion tank, with integrated ARGB lighting, including an Apex pump, flat design, four G1/4 inlets, flexible in installation
    175,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-608
    (1)
    Terms and conditions of aqua computer, with D5 PWM pump, made of durable borosilicate glass, 230 ml capacity, with stainless steel filter, including brackets for floor or wall mounting
    149,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WACH-816
    (2)
    Reservoir with integrated D5 pump for water cooling, with Lighttower water effect, easy to install, integrated RGB lighting
    153,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-658
    (1)
    Reservoir for water cooling systems, compatible with D5 and VPP pumps, includes VPP Apex pump, subtle design, integrated RGB lighting
    134,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 18%
    WAAU-663
    (0)
    Set of reservoir and pump housing from Singularity Computers, 150mm tube made of transparent acrylic glass, top and bottom made of acrylic, flexible mounting options, with RGB lighting
    Price reduced from 97,90 € to 79,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAZU-1248
    (0)
    Expansion tank for water cooling, used in U2 server cases, quick-release fittings on the front, integrated flow and temperature sensors, RGB lighting, compatible with D5 pumps, four G1/4-inch connectors
    71,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-678
    (0)
    Reservoir for water cooling systems, with provision for D5 and VPP pumps, integrated RGB lighting
    56,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WABW-084
    (0)
    Reservoir for DDC pumps, 580 ml filling volume, made of durable acrylic glass, classic black design
    50,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 31%
    WAAU-554
    (0)
    Reservoir by Singularity Computers, with 150 mm tube height, tube made of transparent acrylic glass, lid and base made of frosted and black acrylic, flexible mounting options
    Price reduced from 28,90 € to 19,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-668
    (0)
    Singularity Computers reservoir, with 200 mm tube height, 4x G1/4 inch connections, with D-RGB lighting, with black aluminium caps
    Price reduced from 50,90 € to 36,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 28%
    WAAU-721
    (0)
    Expansion tank for custom water cooling, G1/4 inch thread, RGB lighting
    Price reduced from 45,90 € to 32,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 38%
    WAAU-417
    (0)
    High-quality 150 mm replacement acrylic tube for reservoirs from Bitspower's Z and Z-Multi series
    Price reduced from 12,90 € to 7,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 28%
    WAAU-591
    (0)
    Reservoir by Singularity Computers, with 200 mm tube height, tube made of transparent acrylic glass, lid and base made of frosted and black acrylic, flexible mounting options
    Price reduced from 31,90 € to 22,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-592
    (0)
    Reservoir by Singularity Computers, with 200 mm tube height, transparent acrylic tube, lid and base made of black acetal, flexible mounting options, black
    Price reduced from 30,90 € to 21,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAEK-2225
    (1)
    Flexible pump holder, for various pumps and reservoir combos from EK Water Blocks, for 120mm fan slots
    9,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 21%
    WAPU-178
    (0)
    Vertical mounting bracket from Singularity Computers, For pump and D5/Reservoir Combos, For vertical mounting on radiators
    Price reduced from 22,90 € to 17,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAEK-2226
    (0)
    Flexible pump holder, for various pumps and reservoir combos from EK Water Blocks, for 140mm fan slots
    11,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 10%
    WAZU-1003
    (0)
    Assembly kit for using a LEAKSHIELD with aqua computer ULTITUBE reservoir
    Price reduced from 9,90 € to 8,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WACH-815
    (3)
    Reservoir with integrated D5 pump for water cooling, with Lighttower water effect, easy to install, integrated RGB lighting
    161,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAPU-231
    (0)
    Combination of pump and expansion tank in black, 440 ml expansion tank with vortex-breaking grid, RGB lighting with 22 addressable LEDs, compatible with the iCUE Link ecosystem, connections with standardised G1/4-inch thread
    179,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAPU-234
    (1)
    Combination of pump and reservoir in white, 440 ml expansion tank with turbulence-breaking grid, RGB lighting with 22 addressable LEDs, compatible with the iCUE Link ecosystem, connections with standardised G1/4-inch thread, integrated LCD display.
    249,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAPU-232
    (0)
    Combination of pump and expansion tank in white, 440 ml expansion vessel with vortex-breaking grid, RGB lighting with 22 addressable LEDs, compatible with the iCUE Link ecosystem, connections with standardised G1/4-inch thread.
    179,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAEK-2784
    (0)
    240-mm reservoir-pump combo with D-RGB lighting, featuring a D5 PWM pump, 300 ml volume, eight G1/4-inch fittings, made from acrylic glass and stainless steel, includes mounting for 120-mm fan
    239,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-611
    (0)
    Terms and conditions of aqua computer in the PRO version, with D5-NEXT pump, made of resistant borosilicate glass, 230 ml capacity, with stainless steel filter + pressure compensation membrane, including brackets for floor or wall mounting, with RGBpx lighting
    199,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-709
    (1)
    High-quality pump-AGB combination in black, AGB made of acrylic with a filling volume of 425 ml, ARGB lighting with ten LEDs, reliable Photon D5 pump with high flow rate integrated.
    159,64 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-734
    (0)
    Integrated pump for easy system integration, flat design for compact builds, vertical or horizontal mounting possible, transparent acrylic cylinder, G1/4-inch fittings for maximum compatibility
    135,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WASK-064
    (0)
    Pump and reservoir combo, for D5 and DDC pumps, 5x G1/4-inch connections, mounting on 120mm fan holes, RGB lighting
    134,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 14%
    WAEK-2627
    (0)
    Distribution plate for water cooling, with integrated pump, for Fractal Design Torrent case, addressable RGB lighting
    Price reduced from 415,90 € to 354,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-607
    (0)
    Terms and conditions of aqua computer in the PRO version, for D5 pumps from all manufacturers, made of resistant borosilicate glass, 470 ml capacity, with stainless steel filter + pressure equalization membrane, including brackets for floor or wall mounting, with RGBpx lighting.
    104,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WASK-066
    (0)
    Precisely milled acrylic housing, 5x G1/4 ports, compatible with D5 and DDC pumps, 360 mm form factor
    209,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-727
    (0)
    Ultra-flat design for versatile installation options, integrated Hercules pump, transparent body for coolant visibility, ideal for compact water circuits
    219,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAEK-2795
    (0)
    240-mm reservoir with D-RGB lighting, compatible with D5 and DDC pumps, 300 ml volume, eight G1/4-inch fittings, made from acrylic glass, includes mounting for 120-mm fan
    199,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-119
    (1)
    80mm Bitspower Z-Multi Water tank reservoir, acrylic tube.
    49,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-690
    (0)
    reservoir from aqua computer in the PRO version, for D5 pumps from all manufacturers, made of durable borosilicate glass, 110 ml capacity, with stainless steel filter + pressure compensation membrane, including brackets for floor or wall mounting, with RGBpx lighting
    89,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-651
    (0)
    Sleek cylindrical reservoir, tube made from transparent acrylic, fittings made from black acetal, three fittings for flexible connection options, black securing rings made of aluminium
    Price reduced from 42,90 € to 30,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WABW-062
    (0)
    reservoir, 255 mm tube height, approx. 314 ml filling volume, made of acrylic glass, 5x G1/4 threads
    34,90 €
    Incl. VAT, add. delivery costs
    Pre Order Expected restock at 05.01.2027
    WAAU-693
    (0)
    reservoir from aqua computer, made of durable borosilicate glass, 110 ml capacity, with stainless steel filter, including brackets for floor or wall mounting
    75,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAEK-2224
    (2)
    90-degree bracket, for mounting expansion tanks at a right angle, compatible with 120mm fan holes, optimised for the FLT series from EK Water Blocks, versatile in use
    34,90 €
    Incl. VAT, add. delivery costs
    In Stock

    Water Cooling Reservoirs: Stability, Control, and Style for Your Loop

    Reservoirs play a vital role in your custom water-cooling loop – making filling, bleeding, and pressure balancing simple and effective. They ensure consistent coolant flow while giving your system a visual centrepiece. Whether subtle or bold, every well-built loop starts with the right reservoir.

    Designed for Every Loop and Layout

    From cylindrical tanks to flat distro plates, water cooling reservoirs come in a wide variety of shapes and mounting styles. Many feature multiple G1/4-inch ports, fill level indicators, integrated lighting, or pump combos. This allows you to customise both function and aesthetics – down to the last detail.

    The Central Element of Custom Water Cooling

    Working in tandem with your radiator, blocks, and pump, the reservoir forms the heart of your cooling loop. A smartly placed reservoir improves system efficiency, simplifies maintenance, and often becomes the visual highlight of your build – especially in open or showcase cases.

    Built for Enthusiasts and Visual Perfectionists

    Whether you're chasing peak thermal performance or crafting a clean, beautiful rig – a cooling reservoir gives your loop clarity and control. Crafted from clear acrylic, glass, or frosted materials, many reservoirs support coloured or lit coolant for that extra visual impact.

    Find Your Ideal Reservoir

    Discover your water cooling reservoir at Caseking – for better control, smoother loops, and stunning visuals in every custom PC build.

    Frequently Asked Questions About Water Cooling Reservoirs

    What is a reservoir in a custom water-cooling loop?
    A reservoir is a core component in a custom loop. It helps with filling the system, bleeding air from the lines, and maintaining pressure balance. It also keeps the coolant level stable and adds visual appeal to your setup.
    What types of reservoirs are available?
    You can choose from cylindrical reservoirs, flat tanks, distro plates with integrated channels, or pump-reservoir combos. Each type offers unique mounting and design flexibility, depending on your case and layout.
    How do I mount a reservoir?
    Most reservoirs can be mounted vertically or horizontally using brackets, often on pump bases or directly on radiators. Many models include universal mounting kits to fit various cases and configurations.
    Is the material important?
    Yes – acrylic is crystal-clear and easy to shape, while borosilicate glass is more durable and scratch-resistant. Aluminium is less common due to potential corrosion if used with certain coolants or mixed metals.
    Why choose an illuminated reservoir?
    An RGB or LED-lit reservoir enhances your system's appearance and improves visibility of the coolant level. Paired with coloured fluids, it becomes a striking centrepiece – especially in open builds or showcase systems.