CPU Watercool Heatkiller liquid cooling reservoir 0.375 L black/transparent 70×70×198.5 mm

Watercool Heatkiller liquid cooling reservoir 0.375 L black/transparent is a compact reservoir designed for custom PC liquid-cooling loops. With a coolant capacity of 0.375 L and external dimensions of 70 × 70 × 198.5 mm, this reservoir stores coolant, enables straightforward visual inspection of fluid condition through its transparent sections and supports maintaining the system fill level. The unit combines a black housing with a transparent borosilicate glass tube and is part of a modular tube series developed for reliable, low-maintenance operation in high-end custom cooling systems.

Advantages

The borosilicate glass tube offers high chemical and thermal resistance, scratch resistance and low thermal expansion, making it durable and chemically stable in contact with common coolant additives. A large filling mouth with a bayonet catch lid allows tool-free opening and easy refilling, reducing maintenance time. The reservoir is designed to minimize wasted internal volume, providing a relatively large usable coolant reserve for its size. An anti-cyclone inlay and streaming-optimized pump chamber reduce vortex formation and noise while improving air bleeding and flow stability. Manufactured in Germany, the design supports optional mounts, pump adapters and illumination accessories for flexible integration.

Suitable for

• Custom PC liquid-cooling loops requiring a compact reservoir with visual fluid inspection
• Systems using D5 or DDC pump adapters or standalone reservoir installations
• Builds where low maintenance and reduced air vortexing are desired

Key specifications

• Coolant capacity: 0.375 L
• Dimensions (W × D × H): 70 × 70 × 198.5 mm
• Weight: 0.78 kg
• Material (tube): borosilicate glass (transparent)
• Housing finish: black
• Large filling mouth with bayonet catch lid for tool-free opening
• Anti-cyclone inlay to reduce vortices and simplify air bleeding
• Streaming-optimized pump chamber compatible with pump-adapter versions
• Designed for modular mounting options and optional illumination strips

How to use

Install the reservoir in the chosen position according to available mounting options, ensuring secure fastening to prevent movement. If using a pump-adapter version, attach the compatible pump (D5 or DDC type) following the pump manufacturer’s instructions and the reservoir adapter alignment. Fill the reservoir through the large filling mouth using the appropriate coolant for your system, close the bayonet catch lid tool-free, and run the loop to purge air. Monitor fluid level and condition visually through the transparent tube and top up as needed to maintain proper system fill.

Recommendations

Use coolant formulations recommended for PC liquid cooling and avoid mixing incompatible additives. When installing, allow sufficient space for the 198.5 mm height and consider available bracket or pedestal options for secure mounting. Periodically inspect the reservoir for sediment or discoloration and perform routine system flushing if contamination is detected.