This polytubing is specially designed to move with the turn of the windmill and resist kinking. U.S.A. Compatible With All aeration systems, Material Type Poly, Product Type Windmill accessory, Size in. 1/2, Includes qty. 1 roll of tubing, Length ft. 100, Accessory Type Lines and tubing. Specially designed to move with the turn of the windmill and resist kinking Aeration system can be placed up to 1000 feet from pond when connected by air line 100 feet of hose 1/2in. diameter