Shop Bay Supply's selection of POP Wellnut® products. The unique chloroprene rubber Wellnut® by POP isolates against ambient moisture and gases, vibration and electrical conductivity, and it blocks galvanic corrosion from occurring. Each Wellnut® insert can be installed and removed quickly for fast and efficient work every time. And, because they're made by POP, you know that you're working with premium well nuts. Check out our selection of POP well nuts and other great expansion nut fasteners in our online store today!