UnderDeck Tanks Our tanks are made to the highest quality Australian Manufacturing Standards. We use the latest rotomoulding technology and techniques to ensure consistent manufacuting of our rain water tanks. UD1000 2950mm L x 1160mm W x 330mm H UD1000 Underdeck UD2000 2950mm L x 630mm W x 1160mm H UD2000 Underdeck Installation Guide Download Maintenance Guide Download Conditions of Warranty Download