SIZE: 1/4 NPT male thread to 1/8 NPT female thread hex bushing. PLEASE NOTE, NPT Thread Size is a nominal pipe size and it does not represent the actual diameter. Please look the size chart for the specific thread diameter. NPT thread has a 60 taper, so usually unable to screw the thread to the end MATERIAL: Premium forged brass reducer, thicker and stronger, durable, threads are deep and accurate, high corrosion resistance, low magnetic permeability and high temperature ductility. Quantity: 4pieces 1/4 to 1/8 npt reducing brass bushing adapters EXQUISITE TECHNOLOGY: Brass pipe fittings are designed with deep and accurate thread to ensure tight and no leak connection and easy installation. NPT thread has better sealing performance than straight thread. Can use teflon tape before installation to further strengthen the seal and prevent air leakage Operating Pressure: 1200 psi, Temperature Range of -65F to +250F (-53C to +121C). It's 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