Unlike acrylic PC reservoirs this external aluminum one will radiant heat and help cool the liquid. it holds 750ml and an be outfitted with any G1/4 fittings.
by using an external reservoir you can save space inside your case and by keeping it the highest part of the system you can make sure all air bubbles find there way back to the bottle

Some would argue that aluminum is bad for a cooling system that includes brass and copper metals but the beauty of this water bottle is it has a food grade varnish coating that dosn't let the liquid touch the aluminum on the inside

Step 1: Map Out the Holes for Inlet and Outlet

Aluminum bottles will transfer heat more efficient then
stainless and are extremely easy to machine, the downside of this is they dent and scratch easier then other materials

Use masking tape to protect from scratches and make an area
to draw on. leave a little room between the top of the bottle and the lid for the inlet and mark the outlet on the bottom center of the bottle. Now using a center punch, indent the bottle to guide the drill bit

Step 2: Drill the Holes -Carefully

Use a few different drills to work up to 1/2 this insures the hole doesn't drill bigger
then we want. Do not push into the bottle with the drill but let the weight of the drill do the work. you can snug the bottle in a bench vise to stabilize it but do not clap it down tight, I recommend wrapping a cloth around it also.

Step 3: De-Burr and Final Size the Hole With a Rotary Tool

The key to making the reservoir seal water tight are the
tank fittings also known as bulkhead fittings. These koolance tank fittings

(ADT-XFTK)

come with O rings and stainless washer and nut and have female G 1/4 threads. these fittings are .40 thou more then 1/2"

using a Rotary tool with sanding bit to more around the hole in a circular pattern to widen the hole -also its very important to sand off any burr on the inner and outer surface to get the proper seal. The fittings should slip in snug without having to twist it in.

Repeat this for the bottom

Step 4: Make a Flat Area for Our Tank Fitting to Seal On

The tank fitting is designed to seal against a flat surface
and the side of the bottle is round. (this took me a while to figure out :p)

place a 1/2 X1 inch bolt and two washers threw the hole held by pliers and place 2 more washers and a nut on the outside. now tighten up the bolt until washers sit flat against the side of he bottle.

Step 5: Install the Koolance Tank Fitting (or Equivalent)

install the tank fittings for the inlet and outlet snug up by hand with the washer on the inside
I put a small amount of water pump sealant around the bottom of the washer.

to install the nut and washer on the bottom fitting. find
the appropriate socket for the nut and attach to a socket extension. place the 1/2 nut from earlier in the bottom of the socket and place the tank fittings nut on top of that in the socket and next the washer. hold the bottle upside-down with the tank fitting in and look through the fitting while you lift the socket and nut up into the bottle to meet up with the fitting. carefully more the bottle away from your eye and tighten the two together. this may take some patience