Experience the Nearly Invisible Design of Dymax's Crystal Glass Lily Pipe Set with Surface Skimmer This high-quality crystal quartz glass pipe set features an inflow and outflow pipe, along with a surface skimmer attachment. Available in 12/16 and 16/22 diameters, this set allows proper aeration and water movement while preventing debris accumulation and excessive CO2 loss. Expertly crafted and designed for a gentle water cascade, this set also comes with suction cups for easy installation.