This tool is a vintage Papco No. 400 tubing flaring tool. vintage-papco-tube-pipe-flaring-tool. Manufactured in the United States, it is an automotive and plumbing specialty tool designed to clamp copper, brass, or aluminum tubing in place using its multi-sized internal blocks so a companion cone-screw adapter can flare the tube ends. [1] (https://www.worthpoint.com/worthopedia/antique-vintage-papco-penn-automotive-430018794), [2] (https://www.ebay.com/itm/156240470096), [3] (https://www.worthpoint.com/worthopedia/vintage-papco-tube-pipe-flaring-tool-406101671)Estimated ValueIn its current weathered condition, it is worth approximately $15 to $35.Similar antique tool listings on online marketplaces show variations in pricing based on condition:As-is / Rusty condition: Typically sells on eBay for around $13 to $20.Clean / Working condition: Completer vintage sets or cleaner versions fetch closer to $25 to $35