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The Rite-Hite seal creates a barrier at the “fourth side” of the loading dock. The PitMaster II underleveler seal has a black vinyl main curtain that is secured to the dock leveler and follows its motion to seal the front of the leveler pit from side to side, bottom to top, while the leveler is operated. Mounted to the pit walls, side seals cover up gaps between the dock leveler toe guards and pit walls, while HMWPE plates attach to the leveler subframe on the right and left sides, filling air gaps between the dock leveler and the pit walls. Options include lip corner seals, bumper filler pads, and bumper covers.