Curing tube for mold vulcanization process, with fix valve. Whether for retreading in mold cured system or precured system, the Dobermann® curing tubes offer one of the best cost/benefit option in the market. After about three decades of development and production, we are certain that our curing tubes meet the highest quality and performance standards. Butyl based made and highly resistant to heat, Dobermann® curing tubes, enable a more comfortable and flexible handle in each vulcanization cycle, providing a long lifespan of the product.