Alterna 1-piece Drainage is a specially developed solution for passive drainage, such as wound drainage. Available as a clear pouch, in sterile and non-sterile, it combines the Alterna spiral adhesive with a range of features enabling optimum drainage. Optimal drainage Volume indicator - for easy monitoring of drainage fluid Anti-reflux valve - prevents fluid from contacting the skin or wound Large, soft outlet - for easy drainage, and connects easily to different night bags Spiral adhesive, for security and skin friendliness The Alterna spiral adhesive is a combination of materials designed for security and protection in a spiral-structure, for: Secure adherence to your skin Absorption of moisture from your skin - providing skin friendliness and protection from irritation