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KOOTANS 4pcs High Quality Solid Brass Equal Hex Nipples, 3/8 to 3/8 NPT Male Pipe Adapter Brass Pipe Hex Nipple Fitting Couplings ★ Material: Heavy Duty brass, strong and durable, threads are deep and accurate. Operating temperatures range from -65°F to +250°F (-53°C to +121°C). 1200 psi operating pressure. ★ Size: 3/8 male to 3/8 male NPT thread hex brass nipple, also suitable for 5/8 inch thread pipes. PLEASE NOTE, brass pipe nipples are the USA NPT standard thread, with 60° taper , so 3/8 NPT measured value is about 5/8 inch. ★ Features: 1. Used to connect female pipes with same diameters, or extending the pipe length. NPT Female and male thread with hard connect way, it does not need sealing for most situation. 2. This reducer nipple fitting is made of high quality solid brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability. 3. Designed for use in air, water, oil, gas, etc. 4. These 3/8 to 3/8 npt brass nipples contain low-lead, not recommended for drinking water. ★ Package Include: 4 pieces 3/8 to 3/8 NPT brass hex nipples.