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3/8" NPT Female to 1/4" NPT Male Brass Pipe Adaptor/Adapter Straight Reducer/Reducing Coupling Male to Female: Pipe Fittings: Amazon.com: Industrial & Scientific
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Proline Series 3/8-in x 1/4-in Barbed Splicer Adapter Fitting in the Brass Fittings department at Lowes.com
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Eaton - 3/8" Tube OD x 1/4" NPT 37° Steel Flared Tube Female JIC 37° Swivel to Male Pipe Adapter - 06682116 - MSC Industrial Supply
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Value Collection - 3/8 Female & 1/4 Male NPTF Steel Hydraulic Hose Adapter - 59755272 - MSC Industrial Supply
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