Profile: Colonial Engineering, Inc. manufactures thermoplastic valves, irrigation fittings and piping components. We offer ball valves, check valves, butterfly valves and y-line strainers. We are accredited with ISO 9001:2000 certification. We serve process piping, water treatment, pool/spa, commercial plumbing and irrigation markets. We work with materials such as acetel, noryl, nylon 6, nylon, acrylic, polypropylene, polyethylene, HDPE, high density polystyrene and polycarbonate.