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PVC Pipe Size Dimensions Chart — FORMUFIT

PVC Schedule 80 Sizes Table. Schedule 80 PVC pipe is only compatible with FORMUFIT external-fit products. FORMUFIT internal-fit products, such as Internal Dome Caps, Adjustable Elbows, Internal Couplings and other products that fit inside of the PVC pipe will not work with SCH 80 PVC due to the smaller internal diameter.