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LTWFITTING 5/16 in. O.D. Comp x 1/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685205 - The Home Depot
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LTWFITTING 3/8 in. O.D. x 5/16 in. O.D. Brass Compression Reducing Coupling Fitting (25-Pack) HF62R6525 - The Home Depot
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Amazon.com: Beduan Brass Hose Barb Reducer, 3/8" to 5/16" Barb Hose ID, Reducing Barb Brabed Fitting Splicer Mender Union Air Water Fuel : Industrial & Scientific
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