Oase Tradux Wall and Liner enables you to install cables and wires under the waterline. Installing pumps, lights and water features in to your pond can mean lots of wires and cables, which can look unsightly. The Tradux from Oase provides the perfect conduit to keep them from view. it can be threaded through a wall under the waterline. With the screw couplings, the wall transition can be easily mounted and it offers a secure and clean seal. For pipe sizes: 19mm, 25mm, 32mm, 40mm and 50mm For cable sizes: 3mm to 9mm (in diameter)