Polyethylene includes HDPE, MDPE, and drip hose. HDPE pipe is commonly used in irrigation because of its durability, flexibility, zero susceptibility to leaks, and does not corrode or become brittle in low temperatures. Unlike PVC or stainless steel pipe, HDPE can be joined seamlessly. MDPE has the same advantages of HDPE, but is slightly more flexible and is less dense than HDPE. Drip hose, another category of polyethylene, is used for many types of crops, including trees, vines, and row crops.