1/4" NPT FEMALE × 1/4" NPT FEMALE THREADS : Designed with standard 1/4 inch NPT female threads on both ends (FNPT to FNPT), compatible with most air tools, hoses, and NPT fittings. Suitable for residential and commercial pipe systems. ACTUAL FITTING SIZE: 1/2" ID × 1/2" ID : Although the thread size is 1/4" NPT, the actual inner diameter (ID) of the coupling is approximately 1/2". Please verify both the thread ID and physical dimensions before purchase to ensure compatibility. PREMIUM BRASS CONSTRUCTION : Made from solid brass for excellent corrosion resistance, low magnetic permeability, and high temperature ductility. Built for durability and long-term use in high-pressure or high-heat environments. HEX HEAD FOR SECURE CONNECTION : Features a straight hex nipple design for easy wrench tightening, ensuring a secure and leak-free seal. Ideal for plumbing extensions, air compressors, fuel systems, and hydraulic lines. VALUE 2-PACK INCLUDED : Each package includes 2 pieces of 1/4" NPT female x 1/4" NPT female brass couplers (actual ID 1/2" × 1/2"), perfect for replacement or expanding your pipeline connections with consistent reliability. 2 Pack 1/4 Inch x 1/4 Inch NPT Coupler, Brass Female Pipe Fittin Brass Pipe Hose Fitting with NPT Female Thread Straight Hex Nipple Fast Coupler Good raw material brass, high corrosion resistance, low magnetic characteristics and high temperature ductility Made with precision process, no leaking and durable, easy to connect and disconnect For use with LP and natural gas, refrigeration, and hydraulic applications Package include 2 pcs 1/4 Inch x 1/4 Inch NPT Female Coupling