2-inch In-Ground & Above Ground Swimming Pool Backwash Discharge Hose (200-feet) This backwash hose is made of tough vinyl material and is UV protected. Backwash hose is 2-inches in diameter and comes in various lengths. Use a hose clamp (not included) to connect this flexible and durable backwash discharge hose to your pool filter for draining. NOTE: As many areas require backwash water to be run to the sewer system or curb, make sure to get a hose long enough to reach.