NOT FOR POTABLE WATER.MATERIAL - Premium forged brass, thicker and stronger, durable, high corrosion resistance, low magnetic permeability and high temperature ductility. Quantity: 2 pieces brass reducing adapters. SIZE - 1/2 NPT male thread to 1/4 NPT female thread hex bushing. PLEASE NOTE, 1/2 NPT measured value is 0.72~0.83inches, 1/4 NPT measured value is 0.45~0.54inches. Brass pipe reducer is the American NPT standard thread, with 60 degree taper; its hard connect way and in most cases do not require sealant. FUNCTION - Used to connect female and male pipes with different diameters. Apply to plumbing connections, compressed air, hydraulic, gas and other applications, hex nut for easy tightening and loosening. 1200 psi operating pressure, Temperature range of -65°F to +250°F (-53°C to +121°C). NOTE - Please measure and determine the required size before purchasing, and compare with the size chart. This will ensure you are ordering the exact NPT size for your application requires. These 1/2 to 1/4 npt reducers contain low-lead, NOT FOR POTABLE WATER.