Glossary of Compressed Air Terms :: Q :: Glossary Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Qci Measuring point for compressor acceptance test. Amount of condensate collected in the intercooler. Qca Measuring point for compressor acceptance test. Amount of condensate collected in the aftercooler. Qcr Measuring point for compressor acceptance test. Amount of condensate collected in the air receiver. Quick coupler A coupling device which consists of a spring loaded shutoff valve and a positive locking mechanism. It is used to connect tools, hoses and other accessories. Also known as Quick Disconnect.