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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
    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
    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
    Save 17%
    WAAU-564
    (0)
    Reservoir by Singularity Computers, with 250 mm tube height, tube made of transparent acrylic glass, lid and base made of silver acrylic and black acetyl, flexible mounting options
    Price reduced from 28,90 € to 23,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WASK-065
    (0)
    Pump and reservoir combo, for D5 and DDC pumps, 5x G1/4-inch connections, mounting on 120mm fan holes, RGB lighting
    159,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WASC-497
    (0)
    Core Push Mounting Kit for water cooling, Enables easy mounting of Alphacool Distroplates, Mounting on radiators or inside the case possible
    17,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-587
    (0)
    Reservoir by Singularity Computers, with 100 mm tube height, tube made of transparent acrylic glass, lid and base made of silver and polished acrylic, flexible mounting options
    Price reduced from 26,90 € to 18,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 25%
    WAAU-731
    (0)
    Ultra-slim design for tight builds, pre-assembled pump saves space & time, transparent acrylic body, G1/4 thread for high compatibility
    Price reduced from 161,90 € to 120,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WASC-496
    (0)
    Core Push Mounting Kit for water cooling systems, Enables easy mounting of Alphacool Distroplates, Mounting on radiators or inside the case possible
    19,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 30%
    WAAU-560
    (0)
    Reservoir by Singularity Computers, with 250 mm tube height, tube made of transparent acrylic glass, lid and base made of frosted and black acrylic, flexible mounting options
    Price reduced from 32,90 € to 22,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 30%
    WAAU-569
    (0)
    Protium Reservoir Tube by Singularity Computers, acrylic tube with 250 mm length (60mm OD), for Protium reservoirs & pump tops
    Price reduced from 19,90 € to 13,90 €
    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 28%
    WAAU-723
    (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 18%
    WAAU-590
    (0)
    Reservoir by Singularity Computers, with 200 mm tube height, tube made of transparent acrylic glass, lid and base made of transparent and black acrylic, flexible mounting options
    Price reduced from 26,90 € to 21,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-566
    (0)
    Protium Reservoir Tube by Singularity Computers, acrylic tube with 100 mm length (60mm OD), for Protium reservoirs & pump tops
    20,50 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 27%
    WAAU-666
    (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-121
    (3)
    250mm Bitspower Z-Multi Water tank, being the smallest of the range.
    64,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-589
    (0)
    Reservoir by Singularity Computers, with 100 mm tube height, tube made of transparent acrylic glass, lid and base made of silver acrylic and black acetyl, flexible mounting options
    Price reduced from 26,90 € to 18,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 33%
    WAPU-227
    (0)
    LED ring for illuminating expansion tanks from Singularity Computers, compatible with Protium 3.0
    Price reduced from 17,90 € to 11,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAZU-1259
    (0)
    Adapter for HEATKILLER Tube, Quick-Mount installation, powder-coated steel, for MO-RA IV radiators, mounting kit required separately
    28,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 33%
    WAZU-1258
    (0)
    Adapter for HEATKILLER Tube, Quick-Mount installation, powder-coated steel, for MO-RA IV radiators, Basic Mounting Kit required
    Price reduced from 14,90 € to 9,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-595
    (0)
    Reservoir by Singularity Computers, with 200 mm tube height, tube made of transparent acrylic glass, lid and base made of silver acrylic and black acetyl, flexible mounting options
    Price reduced from 30,90 € to 21,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WABW-087
    (0)
    Reservoir for DDC pumps, 470 ml filling volume, made of durable acrylic glass, classic white design
    49,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 28%
    WAAU-594
    (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
    WABW-086
    (1)
    Reservoir for DDC pumps, 360 ml filling volume, made of durable acrylic glass, classic white design
    44,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WABW-064
    (0)
    Reservoir, 305 mm tube height, approximately 375 ml capacity, made of acrylic glass, 5x G1/4-inch threads.
    39,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-584
    (0)
    Reservoir by Singularity Computers, with 100 mm tube height, tube made of black and transparent acrylic, lid and base made of glossy black acrylic, flexible mounting options
    Price reduced from 26,90 € to 18,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 30%
    WAPU-179
    (0)
    Vertical mounting bracket from Singularity Computers, for pump and D5/Reservoir Combos, for vertical mounting on radiators
    Price reduced from 25,90 € to 17,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 16%
    WARA-252
    (0)
    BP-120WTMP-BK 120 Water Tank Mount Panel (RAD Side)
    Price reduced from 5,90 € to 4,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 29%
    WAAU-585
    (0)
    Reservoir by Singularity Computers, with 100 mm tube height, tube made of transparent acrylic glass, lid and base made of frosted and black acrylic, flexible mounting options
    Price reduced from 26,90 € to 18,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAD-059
    (0)
    This is the finest made fittings we have ever offered! This is a special fitting that can be used through a case top or panel (through-hole) for such things as fluid fill or continuing the water loop.
    8,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-617
    (1)
    Mounting ring by aqua computer, for ULTITUBE reservoirs, additional and decoupled mounting for reservoirs, rubber with stainless-steel insert in black
    5,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-675
    (0)
    Mounting bracket made of steel, for AlphaCool ice cream compensating tanks, for attachment to radiators with 120 mm fan mounting
    7,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-624
    (0)
    Replacement seal by aqua computer, for ULTITUBE reservoirs, made of black rubber
    3,50 €
    Incl. VAT, add. delivery costs
    In Stock
    WAZU-737
    (0)
    Short stand by Watercool, for Heatkiller Tube reservoir, powder-coated steel in black
    15,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WABW-028
    (0)
    Bracket for expansion tank, for mounting on the radiator fan, suitable for 140 mm width
    4,90 €
    Incl. VAT, add. delivery costs
    In Stock
    Save 37%
    WAAU-570
    (0)
    Reservoir attachment from Singularity Computers, made of transparent acrylic, with three G1/4 inch ports, for Protium reservoirs & pump/reservoir combos.
    Price reduced from 7,90 € to 4,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAD-103
    (0)
    This is the finest made fittings we have ever offered! This is a special fitting that can be used through a case top or panel (through-hole) for such things as fluid fill or continuing the water loop.
    8,90 €
    Incl. VAT, add. delivery costs
    In Stock
    WAAU-728
    (0)
    Ultra-flat design for versatile installation options, integrated Hercules pump, transparent body for coolant visibility, ideal for compact water circuits
    234,90 €
    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.