TNK-501 Single 5.25in Bay Reservoir, Rev.1.1

  • TNK-501 is a single 5.25" bay reservoir. Machined from a solid piece of acetal for maximum reliability
  • it has a thick acrylic window
  • front aluminum bezel
  • and stainless steel top cover.
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Stock Code: WC-015-KA

EAN: 0829596907131

MPN: TNK-501

Manufacturer: Koolance

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Product information:

TNK-501 Single 5.25in Bay Reservoir, Rev.1.1

TNK-501 is a single 5.25" bay reservoir. Machined from a solid piece of acetal for maximum reliability, it has a thick acrylic window, front aluminum bezel, and stainless steel top cover. TNK-501 features 8 total G 1/4 BSP threaded sockets: 2 on top, 2 on bottom, and 4 on the back. 6 socket plugs are included.

There are four pre-drilled holes for optional 3mm LEDs on both sides of the acrylic window. Reservoir capacity = approx. 13.3 fl oz (394ml). Weight = 1.5 lbs (0.7kg). Total dimensions = 5.8" (14.8cm) W x 5.4" (13.6cm) L x 1.7" (4.2cm) H.

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Pros and Cons


1. It has a nice aesthetic; subjectively the best looking single-bay reservoir on the market.
2. Fits snugly and without issues, unlike most dual-bay reservoirs.
3. One of the highest fluid capacity single bay reservoirs at 394ml.
4. There's a front fill port on the latest model, rev 1.1 (not shown in the image).
5. Plenty of L.E.D. capacity too.


1. It suffers from the same issues that most single-bay reservoirs have: if you have your pump set high and there is a lot of flow, air may get sucked down the outlet pipe, as the water depth within a single bay res is so shallow.
2. Because air can get sucked down the outlet pipe if you have enough flow, it makes it more difficult to bleed air from your loop than dual-bay or cylinder reservoirs. Plenty of case-tilting may be required.
3. As with all standalone bay reservoirs, you have to run more tubing than would normally be necessary to a separate pump top, which adds more length to the loop and makes it less efficient / tidy.
4. The rear lid of this reservoir is made of stainless steel, although it is high-grade metal that is unlikely to cause corrosion issues. I tested it with a magnet, and it would not stick to the steel (which is apparently a good thing).
5. More fluid capacity is not always better; it mostly serves to increase the weight of the reservoir.
6. Only 3mm L.E.D.s are supported, not 5mm.


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