Allowing bleed water to escape during finishing, the Compodisk float pan for power trowels is crafted of composite material with an acoustic impedance that matches the concrete, thereby imparting its energy into the concrete mass causing the concrete to set from the bottom of the slab to the top. Suitable for use on concrete mixes with or without air entrainment and functional in all weather, pans come in standard sizes up to 60 inches in diameter. Allen Engineering Corp. 800-643-0095.