When used in conjunction with the male QD these quick disconnects seal up completely regardless of the liquids direction of flow, while remaining simple and easy to use. This will work with any H503 and H507 series of quick disconnects. However, it does not work in conjunction with any plastic or brass quick disconnects. These feature a 1/2" Female National Pipe Thread on the ends for easy connectivity to almost anything. The quick disconnect will hold pressure for typical brewing applications when moving liquids at 60psi or less. 1/2" ID. Gasket temperature range is -40° to 250° F. Open port, does not have shut-off.