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Reducing Coupling, Connection Size 1: 3/4 in, Connection Type 1: FNPT, Connection Size 2: 3/8 in, Connection Type 2: FNPT, 1.32 in L, Brass, 3/4-14 x 3/8-18 Thread, 1000 psi, 1.37 in Hex, For Use With: Brass, Bronze, Copper, Steel, Aluminum, and Iron Pipe, -65 to 250 deg F