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Propane Filling Adapter, Sturdy 7/16-20UNF Gas Charging Adapter, For Camping-Style Propane Gas Tank Cylinder Adapter Gas Stove Filling Adapter - Walmart.com
Edge 7/16-20 Male x 3/8-24 Female Adapter
Amazon.com: Fitting JIC AN-05 1/2-20 Male to SAE UNF 7/16-20 Female Adapter : Automotive
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JIC Reducing Nipple UNF 7/16''-20 Female x G1/4'' Male Adjustable Stee | Tameson.com