Dixon 3510 Zinc Plated Steel Air Hose Fitting, Nipple, 3/8" NPT Male x 1/2" Hose ID Barbed Nipple for air and water service Connects to a hose on one end and an NPT female connector on the other Zinc plated steel for greater corrosion resistance than unplated steel Barbed fitting for a tight seal on hoses Rated to 600 psi working pressure at 70 degrees F