Black Solid Nitrile Rubber Balls 4mm 4.5mm 4.76mm 5.3mm 6mm 6.35mm 6.7mm -12.7mm Nitrile balls are ideal for water- and oil-based products. Suitable for a range of different air operated double diaphragm pump manufacturers as well as a variety of other check valve applications. byJuly 3, 2026Last Updated on: July 5, 2026