Bushings - Clay Sales # Size PCX CB-4 4” x 4” PCX CB-6 6” x 6” PCX CB-8 8” x 8” PIPECONX Clay and Plastic Bushings provide a transition on the interior of the coupling while maintaining a straight exterior. This is necessary when applying a shear ring. Tabs on the bushing hold the bushing in place to ensure a tight seal. Specialty Products Bushings - Clay Bushings - Plastic Compression Joint Sealers (Donuts) Manhole Adapters No-Hub Couplings O Rings Shear Rings Where to Buy