Bitspower water-exhaust fitting Installed at the lowest point of your loop, the Bitspower 1/4" threaded drain valve will make maintenance of your custom rig a smooth operation. The built in leak free mechanism means you simply need to replace the cap with the included male fitting. As you tighten the fitting, it will press down on the valve to set free your coolant flawlessly. Don't forget to pre-install a tub at the end of the male fitting, or things may get messy. Features: 1. Hi-Quality Brass Material. 2. High Durability Nickel Finished In Silve Color. 3. Hiding O-Ring Design. 4. RoHS Compliant. PCS/ Pack : 2