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Port Adapter - 1/4 x 3/8 Female Flare x Flare Adapter w/ Copper Gasket Brass - 105 - UR3-46 | HVACDirect.com
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TEKTON 3/4-in to 1/4-in; 3/8-in; 1/2-in Standard Socket Adapter in the Socket Adapters department at Lowes.com
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