Description OPW PSTF-4630 TRANSITION SUMP, 39IN, FIBERGLASS TOP Key Features Large, injection-molded FRP containment chambers are stackable for convenient shipping and storage Removable FRP top allows maximum access during installation of fittings and equipment, and provides a rigid entry fitting area adjacent to the cover for vertical entry of above-grade piping The PSTF-4630 is not adjustable, but FRP Sump Height Extenders (DSFE-4612) are available for the PSTF-4630 to accommodate deeper bury applications