The Maxton ISO3 3" isolation couplings designed for electric isolation (preventing electrolysis) in hydraulic elevators. The ISO3 is comprised of two grooved pipe flanges coupled by a threaded retainer ring. This design has increased strength, reduced weight, and all at a lower cost. The threaded ring design provides superior strength through the consistent sealing torque around the Thermoplastic Seal. Our insulators are created with the highest quality hybrid thermoplastic to provide superior performance, noise and vibration reduction. Complies with ASME A17.1/CSA B44.