Self-sealing bushing for use with standard panel-mounted, internally-sealed switches having 15/32-32 threaded bushings. Seals panel cutout through which the switch bushing passes. Silicone rubber is tolerant to sunlight, weather, salt-spray, ozone, most acids and cleaning solvents. Model 60225: Has rubber bonded on one side. Model 60064: Has rubber bonded on both sides. Meet MIL-B-5423. Specifications. Compatible Switch Bushing: 15/32-32. Washer Diameter: 0.677". Washer Thickness: 0.120". Color: Gray.