Delta Knob-to-Lever Conversion Ball for Single Handle Bathroom Faucets RP20111 - Walmart.com
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The Plumber's Choice 4 in. Centerset Single-Handle Ball Control Solid Lever Bathroom Faucet with Brass Pop Up Stainless Steel in Chrome 1734501-N - The Home Depot
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Danco Metal Faucet Ball Delta/Peerless in the Faucet Repair Kits & Components department at Lowes.com