Brass Fitting, Plastic Drain Cock Threaded, 5/16" (7/16-20) GM: 3042160 Pipe Thread.Drain Cocks and Shutoff Cocks are manufactured for low pressure applications. External seat and internal seat Drain Cocks are manufactured to the highest quality standards. Hand tightening provides leak-proof metal-to-metal seal. A universal lubricant satisfactory with most common fluids is used with Shutoff Cocks but may wash out at higher pressures or with exotic fluids.