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The L138 straight female coupling, made by Lamontite, comes in various sizes from 67mm x 2 inch up to 108mm x 4 inch. This large straight female coupling is versatile and robust, perfect for your needs. A Straight Female Coupling is a plumbing fitting designed to join two pipe sections in a straight line. It features internal (female) threads on both ends to connect with male-threaded pipes or fittings. Commonly used in plumbing and piping systems, these couplings extend pipe lengths or link components, providing a secure and leak-proof connection.. Lamontite Straight Female Coupling - 76mm x 3 Inch Brass L138-76