Heavy duty polyurethane (PU) clear hose. A polyester-polyurethane wall with an embedded PVC coated spring steel wire helix. Moderately flexible with a very smooth inside surface. Extremely abrasion resistant and almost penetration proof. The smooth bore means that the likelihood of blockages occurring are remote, any that do happen are easily spotted. Temperature range of -40°C to +100°C. Perfect for high volume waste producing machines such as wide belt sanders, four sided planers etc. Clockwise spiral.