Coplastix® is a UK registered trademark. Coplastix Limited a part of Industrial Valves Limited. Coplastix® Penstocks ■ Materials UV stabilised ■ Adjustable pressure pads ■ Leakage considerably less than approved standards ■ Reduced operating loads ■ Door having smooth clean face ■ Side wall fixing (no rebate required) ■ Request aperture sizes ■ Resilient seals.