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Made of Nitrile this is a replacement INLET valve assembly for Edson Models 120 Power Pumps and 117 and 557 Side Inlet Manual Pumps. It is also the DISCHARGE valve assembly for all Edson 120 Power Pumps and all size 30 Manual Pumps, Models 117, 554, 557 and 638. Nitrile is an elastomer with very good dynamic strength and is highly resistant to the effects of oils and general waste products.