Simplex, the cooling hose for fast and flexible cooling. Made from high-quality V4A stainless steel spiral tubing for efficient heat transfer. Unlike conventional corrugated pipes, the low surface corrugation (spiral-shaped) facilitates heat transfer and cleaning. Firstly, no water pockets form in the flowing cooling water, and secondly, the fermenting material cannot accumulate between the spiral corrugations. Simply insert into the bung hole and connect to the cooling water. An additional bore in the silicone stopper allows for attaching a fermentation airlock.