How to mount a water-cooling reservoir in your PC case

We take you through several ways to fit a reservoir to your case, including using fan and radiator mounts, as well as attaching it with mounting tape.

Measure case for PC reservoir mount

In this guide we’ll show you how to mount a reservoir in your PC case. While water-cooling reservoirs are more flexible than ever in terms of their size, number of ports, and their ability to use various mounting locations in a typical case, sometimes you’ll need to get creative.

For example, you might not have space to install your reservoir with its stock mount in your case, and your particular case might not offer an alternative, such as a universal pump and reservoir mount. In this guide, we’ll take you through a number of ways to fit your reservoir.

These include using a standard radiator and fan mount, but also some sneaky ways of installing them elsewhere in your case. This can help to make tubing runs easier, and also make better use of space in smaller cases, while making the reservoir easier to fill too.

At Custom PC, we’ve been modding PC cases and components since 2003, giving us loads of experience in the art of customizing your system to make it your own. We know exactly what tools you need and which methods work best.

First steps

Mount a reservoir with screws and custom holes

Fit a reservoir to a fan or radiator mount

Suspend a reservoir in your water-cooling loop

Fit a reservoir with mounting tape

Mount a reservoir with screws and custom holes

First steps

1. Choose size and type of reservoir

Consider reservoir

Tube reservoirs can be mounted using fan mounts in cases, or on radiators. In some situations, they also have mounting brackets for use on some pre-drilled case motherboard trays, or holes you’ve drilled yourself. Square reservoirs can also use fan mounts, but it can be easier to mount them in smaller spaces.

2. Decide on location

Choose reservoir location in PC

It’s likely you have a specific location in mind for your reservoir, but if not, it’s always worth checking to see if mounting it yourself away from fan mounts might free up some space in your case, or make filling and bleeding easier.

3. Identify tubing routes

Identify water-cooling tubing routes to reservoir

Once you’ve worked out roughly where you need to mount the reservoir, you’ll need to work out your tubing routes. You might need to install the rest of the hardware in your PC first to check this accurately, especially in smaller cases, and then you can adjust the position of your reservoir if necessary.

4. Measure up

Measure case for PC reservoir mount

Once you’ve decided on the exact location, check there’s clearance for the pump if it has one, and make sure you can replace your case’s side panels and other PC components once the reservoir is in place. Ensure it can sit level in this position using a spirit level, or it will look unsightly.

Fit a reservoir to a fan or radiator mount

1. Use fan mounting kit

PC reservoir fan mounting kit

Firstly, you may find that using the standard mounting kit suits your needs, so it’s always worth trying it first. These kits usually secure to fans, fan mounts or radiators, but sometimes they offer fittings for case pump mounts if your case has them.

2. Install on fan mount or radiator

Fit reservoir to PC fan mount

Reservoirs don’t typically come with screws to secure them to radiators, as they need to be the correct thread size and length. Most reservoirs will come with their own screws to mount directly on fan mounts, though, while standard fan screws will allow you to secure your reservoir to a fan.

Suspend a reservoir in your water-cooling loop

1. Consider a suspended reservoir

PC reservoir suspended from radiator

Sometimes there might not be anywhere to mount your reservoir, but all is not lost if that’s the case. As a last resort, you can consider using fittings or rigid tubing to hold a small reservoir in place, as long as you won’t be moving your PC around.

2. Use push-to-seal fittings

Push-to-seal water-cooling fittings

One way to suspend a reservoir is to use push-to-seal fittings. These fittings come in two separate parts, with rubber O-rings in one section, so they create a seal when they’re pushed together. This will allow you to mount the reservoir to a tube port for support, while using rigid tubing can also help to secure it.

3. Fit reservoir into place

PC reservoir suspended from radiator

With the reservoir donning the push-to-seal fitting, push it onto the other section of the fitting. Ideally, you want these fittings to be at the base of the reservoir in order to support its weight. You can then use tubing cut to the right length to ensure it sits straight.

Fit a reservoir with mounting tape

1. Use mounting tape

Fit PC reservoir with mounting tape

If your reservoir has a large flat edge, then you can use mounting tape, which is made by the likes of 3M, Scotch and Gorilla, to secure it in place. This is very strong stuff, so be sure on the location. As it’s a rubbery material, it also has vibration-absorbing qualities.

2. Apply tape to reservoir

Fit PC reservoir with mounting tape

Cut a strip of mounting tape that’s large enough to cover the edge of the reservoir. Peel off one side of protective film, then fix it to the edge, before removing the film on the side to stick to your case. This will only work on smooth metal or plastic surfaces – don’t try to stick it to a panel lined with sound-absorbent foam.

3. Fix reservoir in place

Fit PC reservoir with mounting tape

Ensure the reservoir is level, using a spirit level – this is really important, as you won’t be able to adjust it afterwards. Press the reservoir firmly into place with a good amount of force to ensure the mounting tape is pressed firmly onto the case.

Mount a reservoir with screws and custom holes

1. Mark up custom mounting holes

Mark up PC case for reservoir mount

Reservoirs usually come with a mounting kit, which you’ll need to use in order to mark up your mounting holes. Use the mounting mechanism’s screw holes as templates to mark up the surface, having checked that the screws can pass through the surface and out the other side. We’re using an XSPC Photon reservoir in our example.

2. Use appropriate drill bit

Drill holes in PC case for reservoir mount

Use a spirit level to ensure the holes are straight. Now measure the screw threads to see what size drill bit you need to use, then create the holes. Aim to use all of the screws included with the mount in order to ensure your reservoir is secure.

3. Install reservoir

Reservoir fitted into PC case with screws

Use the screws and nuts to secure the reservoir. Once it’s filled with coolant, it will become heavier, so give it a little wiggle to make sure it’s held tightly in place.

Once you’ve completed the most appropriate step for your case and reservoir above, you should have a reservoir right where you want it in your case, happily feeding your loop with coolant. However, if you want to get really creative, you can also make your own reservoir mount from scratch – follow our full guide on how to make a reservoir mount with a 3D printer to see how it’s done.

For more water-cooling ideas, check out our guide on how to install a fill port, as well as our article on how to leak-test water-cooling loops. If you’re new to the world of water-cooling, then make sure you also read our full guide on how to water-cool your PC. If you’re planning a new build, then you’ll also want to read our full guide on how to build a gaming PC, which covers every step of the process.