NPT Brass Thread Plug for Air Conditioner External Unit Valve Cap Key Benefits: Designed specifically for use with air conditioner external unit valve caps and shutoff valve caps, ensuring secure sealing and reliable performance. Made from pure copper for exceptional durability, corrosion resistance, and longterm wear protection. Thickened, explosionproof construction for enhanced safety and longevity in demanding environments. quality deep threads provide strong engagement, reducing the risk of slipping or loosening during use. Available in multiple size options for broad compatibility with various air conditioner models and valve designs. Material and Performance: Pure copper offers strength and resistance to rust compared to other metals, making it suitable for outdoor and moisture applications. Precision threading ensures a snug fit, minimizing air leaks and maintaining system efficiency. Available Sizes: 9.8 mm / 1/4 inch 11 mm / R410 15 mm / 3/8 inch 17 mm / 1/2 inch 21 mm / 5/8 inch 24.5 mm / 3/4 inch Use Scenarios: 1. Replacement plug for air conditioner external unit valve caps to prevent refrigerant leakage and protect internal components. 2. Maintenance work requiring secure sealing during service of HVAC systems in residential or commercial settings. 3. Installation projects where a reliable, corrosionresistant plug is needed for longterm air conditioner performance. This NPT Brass Thread Plug combines precision craftsmanship, robust material quality, and size versatility, offering a dependable solution for sealing and protecting air conditioner external unit valves.