The Plumber's Choice 1/2 in. Brass PEX Barb Plug End Cap Pipe Fitting (5-Pack) 12EPPL5 - The Home Depot
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Amazon.com: KEMKEY Brass End Cap Plug, 1/8" 1/4" 3/8" 1/2" BSP Male Brass Pipe Male Hex Head Brass End Cap Plug Pipe Fitting Coupler Connector Adapter Copper (Size : 1/4") : Industrial