Cooling Station Alphacool Eisstation VPP D5 VPP655 PWM – external pump/reservoir combo for custom liquid cooling

The Alphacool Eisstation VPP D5 VPP655 PWM is an external pump and reservoir combination created for custom PC liquid-cooling loops. It integrates a D5-series pump with a compact reservoir, enabling reliable coolant circulation and straightforward maintenance tasks such as filling and bleeding. The unit supports PWM control for variable pump speed, allowing users to balance cooling performance and acoustic output when paired with a compatible PWM header or controller.

Advantages

The external pump/reservoir design separates moving components from confined case areas, improving accessibility for filling, air removal and servicing. PWM-capable speed control provides flexible flow management to suit different system thermal loads. The integrated reservoir reduces the number of fittings and connection points required in a loop, and the build is compatible with standard custom loop components for straightforward integration into existing systems.

Suitable for

• Custom PC liquid-cooling systems seeking an external pump/reservoir assembly
• Enthusiasts who want easier filling, bleeding and maintenance access
• Systems where adjustable pump speed is needed to balance noise and cooling
• High-performance workstations and gaming rigs using closed-loop custom cooling

Key specifications

• External combination of D5-series pump and integrated reservoir
• PWM-compatible pump speed control for variable flow
• Designed for use with standard custom loop fittings and tubing
• Simplified fill and bleed access for maintenance
• Intended for PC water-cooling applications

How to use

Mount the Alphacool Eisstation VPP D5 VPP655 PWM in an appropriate external or in-case location that provides secure support and convenient access to tubing connections and the reservoir fill port. Connect inlet and outlet tubing to the loop using compatible fittings, ensuring tight, leak-free joints. Attach the PWM control cable to a suitable motherboard header or fan/controller to enable pump speed regulation. When filling, follow standard loop-filling procedures: pre-fill the reservoir, run the pump at low speed to circulate coolant, and open bleed points to remove trapped air. Verify all connections and perform a leak test before powering the full system.

Usage recommendations

Use corrosion-resistant, high-quality fittings and tubing compatible with the reservoir materials. Monitor coolant level and quality periodically and schedule fluid replacement as recommended for your coolant type. Start with lower pump speeds during initial filling and leak testing, then adjust PWM settings to achieve the required balance of flow, cooling performance, and acoustic levels.