Welcome to my living review of the Koolance RP-402X2 and RP-452X2 drive bay reservoir systems. First, I would like to give a huge thanks to Tim from Koolance for sponsoring. The RP-402X2 and the RP-452X2 are the latest in the dual bay pumping reservoir craze.
Koolance RP-402X2 & RP-452X2
These are exceptionally well made “Acetal” reservoirs that can hold and run two (PMP-400, or PMP-450) pumps all in a single dual bay reservoir. These also have two independent reservoirs that can be run independently, shared, or in series depending on your desired setup needs.
RP-402X2 is designed for the PMP-400 pumps (should also work with most DDC/MCP35 series)
RP-452X2 is designed for the PMP-450 pumps (should also work with D5/MCP655 series)
Both reservoirs share the same reservoir system with only slight modifications made to accept each type of pump. I’ll spend some time going though various tests and review items below.
For performance testing I am employing my usual pump testing tools. Flow rate is measured using a King Instruments 7520 flow meter. Pressure differential is measured using a Dwyer 477-5 series digital manometer. Voltage is measure at the pump plug to eliminate vdroop. Power and Amperage is measured using my Mastech power supply.
It’s a heavyweight! All 5 pounds of it when loaded..wow! This is a tribute to the massive machined acetal block construction.
This picture shows removal of the machined block off plate for two pumps on the 402 model. The reservoir comes with this installed so you can run one pump and upgrade later to two pumps if needed. It also comes with G1/4 plugs on the back. If you remove the reservoir side plug, you can use both reservoirs for one pump. Many operational options exist within. I’ll include some configuration options later in the review.
The 452 series uses large aluminum threaded couplers to screw the pumps into place (These are not in contact with water). This photo also provides a quick look at 3/4″ (19mm) OD compression fitting spacing:
More internal pictures – Very easy to take apart and clean or modified as needed:
Ok, that’s enough of looking at the components, it’s time to look at performance next: