Reservoir for custom PC liquid cooling, Singularity Computers Protium 200mm Acetal black

Singularity Computers Protium 200mm Acetal black is a cylindrical reservoir for custom PC liquid cooling loops. Constructed from acetal, the reservoir provides a durable, opaque body with a 200 mm length that fits both compact and full-size builds. The design accepts standard G1/4-style fittings and mounting options common to loop circulation systems, allowing the part to hold coolant volume, ease the filling process and simplify routine maintenance without adding transparent material.

Advantages

The acetal construction resists staining and is less prone to showing deposits compared with clear materials, while the solid black finish conceals internal tubing and pump hardware for a clean visual result. Its 200 mm length balances coolant capacity and space efficiency, making it suitable where a mid-sized reservoir is required. Compatibility with standard fittings and mounting brackets reduces integration work when installing into existing custom-loop layouts.

Suitable for

• Custom PC liquid cooling loops in compact and mid-tower enclosures
• Systems that benefit from an opaque reservoir look to hide tubing and fittings
• Builds requiring moderate coolant capacity without excessive length
• Maintenance workflows where easy filling and bleed access are needed

Key specifications

• Body material: acetal (opaque, black)
• Length: 200 mm
• Shape: cylindrical
• Fitting compatibility: standard G1/4-style threaded ports
• Mounting: designed for common reservoir brackets and clamp systems
• Intended use: desktop PC liquid cooling loops

How to use

Install the reservoir in-line or on a designated mounting point according to your case and bracket configuration, using the standard threaded ports to connect inlet and outlet tubing or hardline fittings. Secure the reservoir with compatible clamps or bracket hardware and ensure all connections are tightened to prevent leaks. Fill the loop following the pump manufacturers and coolant suppliers instructions, prime the pump and run the system to purge air; monitor for leaks and top up coolant as needed during initial circulation.

Usage recommendations

Use compatible G1/4 fittings and ensure proper clamp tension to avoid stress on ports. Prior to first use, verify compatibility with your coolant type—avoid aggressive chemical cleaners that may affect acetal. For maintenance, perform periodic checks for deposits and replace coolant according to the coolant manufacturers schedule.