BV1000-PXC Extension Cover Home » Products » Specification Drainage » Backwater Valves » Backwater Valves » BV1000-PXC Extension Cover MIFAB® Series BV1000-PXC Extension Covers are used to extend height of the backwater valve. Used with the BV1200-R series. Specification Sheet Catalog Catalog Current Catalog: MPB-2022 Return to Products