Proplus Part # 272384 - Proplus 3/8 In. X 1/2 In. Lead Free Brass Compression Female Adapter - Brass Compression Adapters - Home Depot Pro

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3/8 Female x 3/8 Male x 3/8 Compression Outlet Lead Free Brass Max Adapter

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LTWFITTING 3/8 in. O.D. Comp x 3/4 in. FIP Brass Compression Adapter Fitting (5-Pack) HF6661205 - The Home Depot