Inspection and maintenance methods: 1. How to disassemble the automatic drain:Screw half a circle counterclockwise and pull up gently, you can clean the internal impurities and oil to prevent clogging. 2. No drainage and air leakage check:Firstly check whether there are too much impurities and oil inside, blocking the sealing rubber, which can be unscrewed to clean the dirt inside the cup. Secondly, check whether the stainless steel ball is broken into the water, resulting in no automatic drainage. 3. Pre-filtration needs to be manually discharged to avoid clogging without drainage. Specification: Item Type: Air Compressor Drain Valve Water Inlet: G1/2'', that is, DN15. Drain Outlet: Approx. 8mm / 0.315in Pressure: 0-16bar Maximum Operating Temperature: 100℃ Maximum Displacement: 30L/H. Package List: 1 x Air Compressor Drain Valve 1 x Drainer 1 x Pipe Connecting Fitting 1 x Brass Ball Valve