Precise Size & Compatibility：Designed for 5/16" inner diameter hose to 1/4" Male NPT thread (actual thread OD approx. 0.54"). Please refer to the size chart before purchase to ensure proper fit. Premium 304 Stainless Steel Construction：Made from high-quality 304 stainless steel, offering excellent corrosion resistance, strength, and long-term durability. Lead-free material makes it suitable for water, fuel, and air transfer applications. Enhanced Performance: This fitting can withstand pressures up to 3000 psi, easily handling high-pressure environments and suitable for a wide range of applications. Furthermore, its operating temperature range of -40°F to 1800°F (-40°C to 982°C) makes it ideal for extreme high or low temperature environments. Enhanced Structural Design：Features thicker walls, deeper barbs, and extended threads to ensure secure hose grip, improved sealing, and reduced risk of slippage or leaks during operation. Quality inspection: Each connector undergoes NPT thread precision testing to ensure the threads meet standards, guaranteeing a perfect match and seamless integration with your system. stainless steel 5/16" Barb x 1/4" MNPT