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File:Válvula de bola en Hastelloy CX2MW, Hastelloy C22 y Hastelloy C276, una aleación de níquel, similar al inconel, monel e incoloy..jpg - Wikimedia Commons
1/2" FNPT x 1/2" FNPT Series 685 Polypropylene Check Valve with FKM Seals, 1/3 PSI Cracking Pressure & Hastelloy Spring | U.S. Plastic Corp.