Alphacool have recently released the creatively named "Alphacool Leak Testing Tool", for detecting leaks in your PC water cooling loop. The device includes an integrated hand pump to pressurize the system and a 40 cm flexible hose which can be attached to any free G1/4" port in the loop. The device can help identify leaks in the loop caused by bad connections or fittings before you fill the loop ensuring no damage to the computer. Alphacool recommends you leave the device 15 - 20 minutes after pressurizing the system to record if the pressure has dropped indicating a leak in the system. The Alphacool Leak Testing Tool is now available from Alphacool for €29.19.
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View at TechPowerUp Main Site