Air compressor acting up? This Campbell Hausfeld HL031400AV valve plate kit might fix it! It's an OEM replacement part specifically for HL5402 models (and similar 03/04 series). Comes brand new in packaging with everything you need to replace worn valve plates. If your compressor isn't building pressure properly, has air leaks, or just sounds off, the valve plate is often the culprit. This kit gets it running like new again. California folks - there's a Prop 65 warning about potential lead exposure (standard for metal parts), so wash hands after handling. Installation requires some mechanical know-how, but there are good tutorials online if you're handy. Much cheaper than buying a whole new compressor! Perfect for DIYers, workshops, or anyone maintaining their air tools. Campbell Hausfeld is a trusted brand for compressor parts, so you know this fits right. Whether you use your compressor for inflating tires, running nail guns, or painting, having proper valve function is crucial. Before you scrap that compressor, try this $20-30 part first. Often it's all that's needed for years more service. Keep your air tools running strong without the cost of professional repair. Seriously, compressors are simple machines - this kit handles one of their most common failure points!