Recommended for indoor or outdoor cryogenic cylinder storage, barricade racks surround cylinders with 2-in (51-mm) square steel structural tubing, continuously seam welded at all junction points and sealed with exterior grade powder-coat paint for long lasting strength, durability and dependability. Tops ground smooth and capped with high-density polyethylene (HDPE) caps to prevent corrosion and injuries. Features two levels of welded steel chains for each cylinder and clasps to connect the chai