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3/8 inch x 0.591 inch Flat Head Socket Pipe Plugs (DIN 908 (BSPP)) - 316 Stainless Steel: Accu.co.uk: Hardware
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Guardian 1/8 in. 304 Stainless Steel 150 psi Threaded Hexagon Socket Plug 40SP112N018 - The Home Depot
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