The PitMaster under-leveler seal closes off the fourth side of the dock opening — beneath and around the dock leveler. The resulting barrier seals air gaps, reducing energy costs and improving industrial hygiene. The loading dock seal is designed to fit a variety of leveler types, and it features a compressible sealing curtain made of durable black vinyl. The curtain is held in place by spring-loaded arms and flexible stays that keep the seal engaged against the leveler and pit sides throughout leveler operation. A separate header curtain maintains the seal, even when the leveler is in an above-dock position.