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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!

    139 Results
    WAZU-604
    (0)
    Bitspower upgrade kit for Bitspower DDC top with 150mm reservoir and red acrylic top and bottom elements.
    49,90 €
    Incl. VAT, add. delivery costs
    In Stock
    9,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 20%
    WAAU-563
    (0)
    Reservoir by Singularity Computers, with 250 mm tube height, tube made of transparent acrylic glass, lid and base made of silver and frosted acrylic, flexible mounting options
    Price reduced from 28,90 € to 22,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 18%
    WAAU-650
    (0)
    Sleek cylindrical reservoir, tube made from transparent acrylic, fittings with a matte finish, three fittings for flexible connection options, black securing rings made of aluminium
    Price reduced from 37,90 € to 30,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 33%
    WAAU-669
    (0)
    Retention rings from Singularity Computers, for the reservoirs of the Protium series, for attaching the tops
    Price reduced from 17,90 € to 11,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-652
    (0)
    Sleek cylindrical reservoir, tube and fittings made from transparent acrylic, three fittings for flexible connection options, silver securing rings made of aluminium
    Price reduced from 42,90 € to 30,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-649
    (0)
    Sleek cylindrical reservoir, tube and fittings made from transparent acrylic, 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
    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
    Save 33%
    WAAU-567
    (0)
    Protium Reservoir Tube by Singularity Computers, acrylic tube with 150 mm length (60mm OD), for Protium reservoirs & pump tops
    Price reduced from 14,90 € to 9,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 40%
    WAAU-577
    (0)
    Retention rings from Singularity Computers, for the reservoirs of the Protium series, for mounting the attachments
    Price reduced from 9,90 € to 5,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-593
    (0)
    Reservoir by Singularity Computers, with 200 mm tube height, tube made of transparent acrylic glass, lid and base made of silver and polished acrylic, flexible mounting options
    Price reduced from 30,90 € to 21,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-667
    (0)
    Singularity Computers reservoir, with 200 mm tube height, 4x G1/4 inch connections, with D-RGB lighting, with aluminium caps in silver
    Price reduced from 50,90 € to 36,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-653
    (0)
    Sleek cylindrical reservoir, tube made from transparent acrylic, fittings with a matte finish, three fittings for flexible connection options, silver securing rings made of aluminium
    Price reduced from 42,90 € to 30,90 €
    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
    WAAU-609
    (0)
    Reservoir from aqua computer, with D5 PWM pump, made of durable borosilicate glass, 350 ml capacity, with stainless steel filter, including brackets for floor or wall mounting
    154,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAPU-233
    (0)
    Combination of pump and expansion tank in black, 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
    Out of Stock
    WAEK-2783
    (0)
    120-mm reservoir-pump combo with D-RGB lighting, featuring a D5 PWM pump, 125 ml volume, nine G1/4-inch fittings, made from acrylic glass and stainless steel, includes mounting for 120-mm fan
    199,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-706
    (0)
    distroplate for water cooling, with pre-mounted VPP pump, easy to install, integrated RGB lighting
    189,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-120
    (4)
    150mm Bitspower Z-Multi Water tank reservoir, acrylic tube.
    59,90 €
    Incl. VAT, add. delivery costs
    Out of 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
    Out of Stock
    WASC-498
    (0)
    Core Push Mounting Kit for water cooling, Enables easy mounting of Alphacool Distroplates, Mounting on radiators or inside the case possible
    15,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-694
    (0)
    Replacement tube for custom water cooling, suitable for ULTITUBE 50 reservoir from aqua computer, made of glass
    14,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-618
    (0)
    Retrofit RGB LED lighting by aqua computer, for ULTITUBE reservoirs, featuring 13 digitally addressable RGB LEDs, compatible with RGBpx devices, made of silicone
    13,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAEK-1847
    (0)
    reservoir pump combo from EKWB, reservoir with 205 ml capacity, reliable Xylem D5 pump included, 3.9 m head & 1,500 L/h flow rate, mounting system with wall bracket + pump decoupling, addressable RGB lighting
    199,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-613
    (2)
    reservoir from aqua computer in the PRO version, with D5-NEXT pump, made of durable borosilicate glass, 470 ml capacity, with stainless steel filter + pressure compensation membrane, including brackets for floor or wall mounting, with RGBpx lighting
    209,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-674
    (4)
    reservoir with D5-NEXT pump, made of resistant borosilicate glass, 470 ml capacity, LEAKSHIELD protects against leaks, with RGBpx lighting
    339,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-610
    (0)
    reservoir from aqua computer, with D5-PWM pump, made of durable borosilicate glass, 470 ml capacity, with stainless steel filter, including brackets for floor or wall mounting
    159,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-688
    (0)
    reservoir from aqua computer, with D5 PWM pump, made of durable borosilicate glass, 110 ml capacity, with stainless steel filter, including brackets for floor or wall mounting
    149,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WASK-063
    (0)
    Pump and expansion tank combo, for D5 and DDC pumps, 5x G1/4-inch ports, fits 120mm fan mounts, RGB lighting
    134,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAZU-1245
    (0)
    Reservoir-pump combo with ARGB lighting, equipped with a D5 pump, 330 ml capacity, two G1/4-inch ports, made from acrylic glass and acetal
    179,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAEK-1845
    (2)
    Reservoir pump combo from EKWB, reservoir with 405 ml capacity, reliable Xylem D5 pump included, 3.9 m head & 1,500 L/h flow rate, mounting system with wall bracket + pump decoupling, addressable RGB lighting
    209,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAZU-1246
    (0)
    Reservoir-pump combo with aRGB lighting, equipped with a D5 pump, 250 ml capacity, two G1/4-inch ports, made from acrylic glass and acetal
    74,90 €
    Incl. VAT, add. delivery costs
    Out of 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
    Out of Stock
    WABW-088
    (0)
    Reservoir for DDC pumps, 580 ml capacity, made of durable acrylic glass, classic white design.
    15,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-603
    (0)
    Terms and conditions of aqua computer, for D5 pumps from all manufacturers, made of durable borosilicate glass, 230 ml capacity, with stainless steel filter, including brackets for floor or wall mounting
    81,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAZU-778
    (0)
    Modular reservoir from Watercool, for mounting on a D5 pump, container made of borosilicate glass, 500 ml capacity, 2x G1/4 inch connection, black aluminium struts
    119,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAZU-734
    (2)
    Terms and conditions bracket from Watercool, for Heatkiller Tube expansion tank, for mounting on the case wall
    19,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAZU-749
    (3)
    Modular reservoir from Watercool, designed to be mounted on a D5 pump, container made of borosilicate glass, 250 ml capacity, 2x G1/4 inch connections, aluminium struts in black.
    109,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAAU-433
    (2)
    Modular reservoir by Watercool, container made of borosilicate glass, 375 ml capacity, 2x G1/4 inch connection, with black aluminium struts
    104,90 €
    Incl. VAT, add. delivery costs
    Out of Stock
    WAZU-1316
    (0)
    Modular expansion tank with D5 pump slot, expandable with additional pump modules, high-quality acrylic and acetal, prepared for optional ARGB module
    74,90 €
    Incl. VAT, add. delivery costs
    Out of 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.