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Parker - Industrial Pipe Adapter: 1/2" Female Thread, 3/4-16 Male Thread, Male Straight Thread O-Ring x Female NPTF - 09107921 - MSC Industrial Supply
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Proline Series 3/4-in x 1/2-in Threaded Female Hose x Mip Adapter Fitting in the Brass Fittings department at Lowes.com
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Everbilt 1/2 in. x 3/4 in. Copper Pressure Cup x FIP Female Adapter Fitting C603HD1234 - The Home Depot
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