Laguna Non-Kink Tubing provides the strength and flexibility required in a variety of pond applications. The thick and durable hosing is reinforced with solid concentric wire ribbing that will not collapse due to back pressure or a reasonable amount of weight from gravel or covering material. The tubing material is thick yet flexible and will not kink, ensuring minimum water resistance and maximum water flow, even in the sharpest turns. The black hosing does not encourage the growth of algae and can easily be camouflaged. Laguna Non-Kink Tubing material is non-toxic and will not harm fish or plants.