BV1000-PXC Extension Cover Home » Products » Specification Drainage Products » 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 List Pricing Current Catalog: MPB-2024 Return to Products