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LTWFITTING 3/8-Inch OD x 1/4-Inch OD Compression Reducing Union,Brass Compression Fitting(Pack of 5) - Compression Fitting Ferrules - Amazon.com
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LTWFITTING 5/16 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685605 - The Home Depot
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LTWFITTING 3/8-Inch OD Compression Union,Brass Compression Fitting(Pack of 10) - Compression Fitting Ferrules - Amazon.com
3/8 Tube OD Compression to 1/2 Npt Female Pipe Adapter Straight Fitting for Copper Tubing Water Oil Air
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