Reliable drainage systems are essential for any building project. Metabronze has earned a strong reputation as one of the best allproof drain suppliers nz by offering durable and effective drainage solutions. Their allproof drains are built to handle large amounts of water, resist rust, and stay strong in different weather conditions. Reliable drainage systems are essential for any building project. Metabronze has earned a strong reputation as one of the best allproof drain suppliers nz by offering durable and effective drainage solutions. Their allproof drains are built to handle large amounts of water, resist rust, and stay strong in different weather conditions.