Self-sinking air supply tubing keeps pond airline tubing at the bottom of the pond Improves water feature appearance and reduces installation time Constructed of thick-walled, puncture-resistant, extruded PVC Non-kinking and flexible UV-resistant, lead-free, and fish-safe Aquascape 3/8″ Weighed Aeration Tubing is the ideal aeration tubing for installation in most ponds and water features. Many types of aeration tubing will float to the surface of ponds, exposing the unsightly tubing. Installing Aquascape Weighted Aeration Tubing will keep pond airline tubing out of sight at the bottom of the pond without the use of weights, improving water feature appearance and significantly reducing installation time. Constructed of thick-walled, puncture resistant, extruded PVC, the tubing will not kink and is flexible, even in cold weather. The smooth interior reduces friction to maximize airflow and reduce system pressure requirements. Aquascape self-sinking, weighted tubing is UV-resistant, lead-free, fish-safe, and black in color to disguise it on the pond bottom. The tubing has a 3/8″ inside diameter, .69″ outside diameter, a 2″ minimum bend radius, and is rated for all temperatures. Aquascape Weighted Aeration Tubing is proudly made in the USA. Please Note: Weighted tubing size is not compatible with Aquascape 2-Outlet and 4-Outlet Pond Aeration Kits – item #s 75000 and 75001 Aquascape is passionate about water features, providing innovative products and designs that stand above the competition.