25 PCS PACKAGE: The brass hex bushing fitting kit includes 5 sizes, 1/4" × 1/8" NPT 5pcs, 3/8" × 1/8" NPT 5pcs, 3/8" × 1/4" NPT 5pcs, 1/2" × 1/4" NPT 5pcs, 1/2" × 3/8" NPT 5pcs with teflon tape. Various sizes can meet your work needs PREMIUM MATERIAL: KOOTANS brass bushings are made of CA360 premium forged brass, thicker, stronger and durable. Our npt pipe fitting has accurate, smooth and deep thread, with corrosion resistance, high temperature ductility, low magnetic permeability and long service life 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 WORKING ENVIRONMENT: Brass fittings with max working pressure up to 1200psi, temperature range of -65°F to +250°F (-53°C to +121°C) WIDE APPLICATION: The brass hex bushing kit can be used for connection or extension of various pipes. Apply to plumbing connections, compressed air, refrigeration, hydraulic systems, instrumentation, gas and other applications. Hex nut structure design for easy Installation and removal SIZE NOTE: The brass fittings NPT thread size is a nominal pipe size and it does not represent the actual diameter. NPT thread has a 60° taper, this design makes the cooperation between the threaded joint and the inner wall of the pipeline closer to ensure stable and firm connection and increase sealing performance