High quality and strong structure, can be used for a long time, not easy to split. Flexible and extensible designs that can be adjusted according to different shapes. Fix alignment or other plumbing problem, bathroom sink drain extensions can be adjusted to address offsets or other difficult plumbing problems. Adjustable ripple designs, can be easily expanded and bent into "U", "S" or other shapes. Special visible one‑way check valve has a 3‑magnet designs that will close when not working. The black rubber gasket forms a good seals at the joint and helps sealing the smell. Fast drainage and good connections, 40mm / 1.6in in diameter, large enough to drain quickly and not easily clogged, and are tightly connected to the sink outlet by a rubber connection without leakage.