The Campbell Hausfeld compressor shut-off kit (PA117000AV) is designed to shut off the airflow between an air compressors tank and the piping system. This kit should be installed on the 3/4-inch discharge port of the air tank. The kit includes a 3/4-inch steel adapter, 3/8-inch pipe nipple and 3/8-inch NPT ball valve. Finish your projects faster and easier with Campbell Hausfeld. The Air Power Expert ®