Brand New 10 pack 3/8" Hose ID/Hose Barb to 1/4" Female NPT FIP FPT Straight Brass Fitting Fuel/Air/Water/Boat/Gas/Oil WOG Straight Hose barb to female npt pipe fitting 3/8 Hose ID (Your hose / Tubing must read 3/8 ID for this to fit) Npt Thread: 1/4" Npt x 18 Tpi Female (Actual Nominal Thread Size 1/2") Working Pressure for up to 250 PSI @ -65F to +265F Suitable for connecting lines for air, water, fuel, oil and inert gases. Common hot water, oil, gas, cold water, fuel, coolant, HVAC, RV, transmission, diff, engine.