Block Benefits of Polycast Trench Drain Choices Grate & Frame Choices Accessories Catch Basins Channel Data & Sizes (600 & 700 Series) Installation Photos Organizations Using... channel reinforcement (700 Series frames, DURAGUARDTM , Polyguard) Solid Tires High Speed (over 15 mph) High Frequencies The POLYCAST(R) 700 Series offers exceptional impact resistance.... Designed for extreme loads, the HARDNOSETM cast iron frame strengthens the grating and drain assembly for extra durability. The POLYCAST(R) 700 Series is recommended for heavy...