Internal Sealing The WEKO-SEAL internal joint renewal system offers permanent, cost-efficient leak and infiltration sealing in water, wastewater, gas, and industrial process piping while greatly reducing excavation and cost. Seals are available for any pipe size- 16" diameter up through 216" and larger- any material, any shape. They are installed internally by Miller's skilled, confined-space entry qualified technicians with up to 5000 feet between access points. These seals are flexible rubber leak clamps that ensure a noncorrodible, bottle-tight seal around the full inside circumference of the pipe-joint area. Their unique design incorporates a series of proprietary and patented lip seals that create a leak proof fit on either side of the joint. WEKO-SEAL provides a positive, flexible seal, while saving up to 60% over conventional external repair methods using individual excavations. WEKO-SEALS can be used in concrete, reinforced concrete, cast iron, ductile iron, steel, vitrified clay, PE or PVC piping. Seals are in service in potable water distribution lines, sanitary sewer lines, storm sewers, natural gas piping, industrial piping, and both nuclear and fossil fuel power plants for cooling water, circulation water, service water, fresh water and seawater applications. The seals have also been used as end seals and joint seals for pipe lining systems to ensure a positive pressure-tight lining. Seals can be designed for and installed in standard round pipes as well as lines with unusual shapes including oval, square or those having compound angles. During the last two decades, Miller has handled over 120,000 failure-free installations of WEKO-SEAL Internal Seals in locations throughout the United States, Canada and Mexico. Dozens of gas utilities, municipalities and industrial plants have made them a vital part of their pipeline maintenance and rehabilitation efforts.