Reservoir Cap Aqua-Computer Deckel for ULTITUBE Expansion Tank with Pressure Port (34116)

The Aqua-Computer Deckel replacement cap is designed for the ULTITUBE expansion/reservoir tank and provides a sealed interface with an integrated pressure port. This cap allows secure closure of the coolant reservoir while offering a dedicated connection point for pressure monitoring or additional fittings. It is intended for custom liquid-cooling applications in PC builds and compatible industrial cooling setups, ensuring reliable containment and functional expandability.

Advantages

The cap supplies a leak-resistant seal for the expansion tank while preserving access to system pressure through a dedicated port. Its construction and compatibility with the ULTITUBE reservoir simplify integration into existing loops and permit connection of pressure sensors, gauges, or adapters without modifying the tank body. This design supports both routine maintenance and upgrades by keeping the main reservoir sealed and accessible.

Suitable for

• Custom PC liquid-cooling loops using the ULTITUBE expansion tank
• Integration of pressure sensors or gauges in cooling systems
• Industrial or laboratory cooling setups that require a compact reservoir cap with a pressure port

Key specifications

• Replacement cap compatible with ULTITUBE expansion/reservoir tanks
• Integrated pressure port for sensor or fitting connection
• Sealed interface designed to prevent coolant leakage
• Compact form factor to fit standard reservoir installation space

How to use

Remove the existing cap from the ULTITUBE expansion tank and install the replacement cap by seating it fully and tightening according to the tank's original fastening method to ensure a secure seal. Connect a pressure sensor, gauge, or an adapter fitting to the pressure port as required, following the accessory manufacturer's instructions for thread engagement and sealing. After installation, verify the connection for leaks and confirm that the pressure monitoring device reports expected values before returning the system to normal operation.

Recommendations

Use compatible fittings and sensors rated for coolant contact and the expected system pressure. When installing or removing the cap, follow system drain and refill procedures to avoid spills. Periodically inspect the seal and port connection for signs of wear or leakage and replace components if deterioration is observed.